注意查找日期的单元格格式，日期本质上是一个数字，在查找时不能使用日期来匹配一个text函数的文本结果。

pull prose

修改prose/app/views/header.js,107行代码

1
2

var newPath = pathUtil.join.apply(null, parts.concat([date + '-' + value + '.' + extension]));
//util.stringToUrl(value) cause non-alphanumeric words disappeared

2. 注册heroku,并cli

使用pose.io来在线编写

以前使用小书匠，感觉很方便，但随着时间的推移。发现了一些问题。

• 小书匠收费了
• 免费版不能同步文档的配置
• 图片插入问题还无法很好解决

  在寻求免费方案时发现了pose.io，但我用的是hexo，折腾一番后请看_pose.yml文件的配置吧。
  ui修改方面，根据文章列表div的分类名查找所在文件，添加修改按钮

hexo-ruby-character插件的使用

1. 目前将nodejs降级到7.1.0，编译不报错。
2. 在面临大量转换时还是得使用nodepad++之类的使用正则表达式转换。比如进行如下的替换：

   1 2	'([^0-9#，。？\r\n ])' 替换为 ' {% ruby \1 %}' '\r\n{' 替换为 '\r\n### {'

gitment认证域名安全证书过期

1. Heroku搭建：
   gh-oauth-server
2. 替换gitment.browser.js里的url https://gh-oauth.imsun.net/ 为heroku应用域名
3. 替换coment.ejs里的js的引用

   1 2 3 4

   <%- css('vendor/default') %> <%- js('vendor/gitment.browser') %> <!--<link rel="stylesheet" href="https://imsun.github.io/gitment/style/default.css"> <script src="https://imsun.github.io/gitment/dist/gitment.browser.js"></script>-->

(title)\n(content)
01 咏鹅骆宾王

鹅，鹅，鹅，
曲项向天歌。
白毛浮绿水，
红掌拨清波。

02 敕勒歌北朝民歌

敕勒川，阴山下。
天似穹庐，笼盖四野(ya3)。
天苍苍，野茫茫，
风吹草低见(xian4)牛羊。

03 春晓孟浩然

春眠不觉晓，
处处闻啼鸟。
夜来风雨声，
花落(luo4)知多少。

04 回乡偶书贺知章

少小离家老大回，
乡音无改鬓毛衰(cui1)。
儿童相见不相识，
笑问客从何处来。

05 静夜思李白

床前明月光，
疑是地上霜。
举头望明月，
低头思故乡。

06 忆江南白居易

江南好，风景旧曾(ceng2)谙。
日出江花红胜火，
春来江水绿如蓝，
能不忆江南？

07 游子吟孟郊

慈母手中线，
游子身上衣。
临行(xing2)密密缝，
意恐迟迟归。
谁言寸草心，
报得三春晖？

08 古朗月行(xing2)（节选）李白

小时不识月，
呼作白玉盘。
又疑瑶台境，
飞在青云端。

09 元日王安石

爆竹声中一岁除，
春风送暖入屠苏。
千门万户曈曈日，
总把新桃换旧符。

10 登鹳雀楼王之涣

白日依山尽，
黄河入海流。
欲穷千里目，
更上一层楼。

11 望庐山瀑布李白

日照香炉生紫烟，
遥看瀑布挂前川。
飞流直下三千尺，
疑是银河落(luo4)九天。

12 早发白帝城李白

朝辞白帝彩云间，
千里江陵一日还。
两岸猿声啼不住，
轻舟已过万重山。

13 江畔独步寻花杜甫

黄四娘家花满蹊，
千朵万朵压枝低。
留连戏蝶时时舞，
自在娇莺恰恰啼。

14 六月二十七日望湖楼醉书苏轼

黑云翻墨未遮山，
白雨跳珠乱入船。
卷地风来忽吹散，
望湖楼下水如天。

15 小池杨万里

泉眼无声惜细流,
树荫照水爱晴柔。
小荷才露尖尖角,
早有蜻蜒立上头。

16 四时田园杂兴范成大

昼出耘田夜绩麻，
村庄儿女各当家。
童孙未解供耕织，
也傍桑阴学种瓜。

17 悯农（其一）李绅

春种一粒粟，
秋收万颗子。
四海无闲田，
农夫犹饿死！

18 悯农(其二）李绅

锄禾日当午，
汗滴禾下土。
谁知盘中餐，
粒粒皆辛苦

19 晓出净慈寺送林子方杨万里

毕竟西湖六月中，
风光不与四时同。
接天莲叶无穷碧，
映日荷花别样红。

20 绝句杜甫

迟日江山丽，
春风花草香。
泥融飞燕子，
沙暖睡鸳鸯。

21 送元二使安西王维

渭城朝雨浥轻尘，
客舍青青柳色新。
劝君更尽一杯酒，
西出阳关无故人。

22 赋得古原草送别白居易

离离原上草，一岁一枯荣。
野火烧不尽，春风吹又生
远芳侵古道，
晴翠接荒城，
又送王孙去，萋萋满别情。

23 鹿柴王维

空山不见人，
但闻人语响。
返景入深林，
复照青苔上。

24 凉州词王翰

葡萄美酒夜光杯，
欲饮琵琶马上催。
醉卧沙场君莫笑，
古来征战几人回？

25 别董大高适

千里黄云白日曛，
北风吹雁雪纷纷。
莫愁前路无知己，
天下谁人不识君。

26 出塞王昌龄

秦时明月汉时关，
万里长征人未还。
但使龙城飞将在，
不教胡马度阴山。

27 望天门山李白

天门中断楚江开，
碧水东流至此回。
两岸青山相对出，
孤帆一片日边来。

28 山行杜牧

远上寒山石径斜，
白云生处有人家。
停车坐爱枫林晚，
霜叶红于二月花。

29 长歌行汉乐府

青青园中葵，
朝露待日晞。
阳春布德泽，
万物生光辉。
常恐秋节至，
焜黄华叶衰。
百川东到海，
何时复西归？
少壮不努力，
老大徒伤悲。

30 绝句杜甫

两个黄鹂鸣翠柳，
一行白鹭上青天。
窗含西岭千秋雪，
门泊东吴万里船。

31 竹里馆王维

独坐幽篁里，
弹琴复长啸。
深林人不知，
明月来相照。

32 梅花王安石

墙角树枝梅，
凌寒独自开。
遥知不是雪，
为有暗香来。

33 石灰吟于谦

千锤万击出深山，
烈火焚烧若等闲。
粉身碎骨浑不怕，
要留清白在人间。

34 九月九日忆山东兄弟王维

独在异乡为异客，
每逢佳节倍思亲。
遥知兄弟登高处，
遍插茱萸少一人。

35 七步诗曹植

煮豆燃豆萁，
漉豉以为汁。
萁在釜下燃，
豆在釜中泣。
本是同根生，
相煎何太急。

36 望洞庭刘禹锡

湖光秋月两相和，
潭面无风镜未磨。
遥望洞庭山水翠，
白银盘里一青螺。

37 惠崇《春江晓景》苏轼

竹外桃花三两枝，
春江水暖鸭先知。
蒌蒿满地芦芽短，
正是河豚欲上时。

38 题西林壁苏轼

横看成岭侧成峰，
远近高低各不同。
不识庐山真面目，
只缘身在此山中。

39 乐游原李商隐

向晚意不适，
驱车登古原。
夕阳无限好，
只是近黄昏！

40 赠汪伦李白

李白乘舟将欲行，
忽闻岸上踏歌声。
桃花潭水深千尺,
不及汪伦送我情。

41 黄鹤楼送孟浩然之广陵李白

故人西辞黄鹤楼，
烟花三月下扬州。
孤帆远影碧空尽，
惟见长江天际流。

42 塞下曲卢纶

林暗草惊风，
将军夜引弓。
平明寻白羽，
没在石棱中。

43 浪淘沙刘禹锡

九曲黄河万里沙，
浪淘风簸自天涯。
如今直上银河去，
同到牵牛织女家。

44 渔歌子张志和

西塞山前白鹭飞，
桃花流水鳜鱼肥。
青箬笠，绿蓑衣，
斜风细雨不须归。

45 江雪柳宗元

千山鸟飞绝，
万径人踪灭。
孤舟蓑笠翁，
独钓寒江雪。

46 游园不值叶绍翁

应怜屐齿印苍苔，
小扣柴扉久不开。
春色满园关不住，
一枝红杏出墙来。

47 逢雪宿芙蓉山主人刘长卿

日暮苍山远，
天寒白屋贫。
柴门闻犬吠，
风雪夜归人。

48 竹石郑燮

咬定青山不放松，
立根原在破岩中。
千磨万击还坚劲，
任尔东西南北风。

49 独坐敬亭山李白

众鸟高飞尽，
孤云独去闲。
相看两不厌，
只有敬亭山。

50 枫桥夜泊张继

月落(luo4)乌啼霜满天，
江枫渔火对愁眠。
姑苏城外寒山寺，
夜半钟声到客船。

51 寻隐者不遇贾岛

松下问童子，
言师采药去。
只在此山中，
云深不知处。

52 墨梅王冕

吾家洗砚池头树，
个个花开淡墨痕。
不要人夸好颜色，
只留清气满乾坤。

53 咏柳贺知章

碧玉妆成一树高，
万条垂下绿丝绦。
不知细叶谁裁出，
二月春风似剪刀。

54 清明杜牧

清明时节雨纷纷，
路上行人欲断魂。
借问酒家何处有，
牧童遥指杏花村。

55 寒食韩翃

春城无处不飞花，
寒食东风御柳斜。
日暮汉宫传蜡烛，
轻烟散入五侯家。

56 春日朱熹

胜日寻芳泗水滨，
无边光景一时新。
等闲识得东风面，
万紫千红总是春。

57 宿建德江孟浩然

移舟泊烟渚，
日暮客愁新。
野旷天低树，
江清月近人。

58 饮湖上初晴后雨苏轼

水光潋滟晴方好，
山色空濛雨亦奇。
欲把西湖比西子，
淡妆浓抹总相宜。

59 从军行王昌龄

青海长云暗雪山，
孤成遥望玉门关。
黄沙百战穿金甲，
不破楼兰终不还。

60 凉州词王之涣

黄河远上白云间，
一片孤城万仞山。
羌笛何须怨杨柳，
春风不度玉门关。

61 秋浦歌李白

白发三千丈，
缘愁似个长。
不知明镜里，
何处得秋霜。

62 商山早行温庭筠

晨起动征铎，
客行悲故乡。
鸡声茅店月，
人迹板桥霜。
槲叶落(luo4)山路，
枳花明驿墙。
因思杜陵梦，
凫雁满回塘。

63 芙蓉楼送辛渐王昌龄

寒雨连江夜入吴，
平明送客楚山孤。
洛阳亲友如相问，
一片冰心在玉壶。

64 江南逢李龟年杜甫

岐王宅里寻常见，
崔九堂前几度闻。
正是江南好风景，
落(luo4)花时节又逢君。

65 滁州西涧韦应物

独怜幽草涧边生，
上有黄鹂深树鸣。
春潮带雨晚来急，
野渡无人舟自横。

66 乌衣巷刘禹锡

朱雀桥边野草花，
乌衣巷口夕阳斜。
旧时王谢堂前燕，
飞入寻常百姓家。

67 江南春杜牧

千里莺啼绿映红，
水村山郭酒旗风。
南朝四百八十寺，
多少楼台烟雨中。

68 竹枝词刘禹锡

杨柳青青江水平，
闻郎江上唱歌声。
东边日出西边雨，
道是无晴却有晴。

69 秋夕杜牧

银烛秋光冷画屏，
轻罗小扇扑流萤。
天阶夜色凉如水，
坐看牵牛织女星。

70 赠花卿杜甫

锦城丝管日纷纷，
半入江风半入云。
此曲只应天上有，
人间能得几回闻。

71 题临安邸林升

山外青山楼外楼，
西湖歌舞几时休。
暖风熏得游人醉，
直把杭州作汴州。

72 示儿陆游

死去元知万事空，
但悲不见九州同。
王师北定中原日，
家祭无忘告乃翁。

73 朝天子·咏喇叭王磐

喇叭，唢呐，
曲儿小，腔儿大。
官船往来乱如麻，
全仗你抬身价。
军听了军愁，
民听了民怕，
哪里去辨什么真共假?
眼见的吹翻了这家，
吹伤了那家，
只吹的水尽鹅飞罢！

74 秋夜将晓出篱门迎凉有感陆游

三万里河东入海，
五千仞岳上摩天。
遗民泪尽胡尘里，
南望王师又一年。

75 夏日绝句李清照

生当作人杰，
死亦为鬼雄。
至今思项羽，
不肯过江东。

76 菩萨蛮-书江西造口壁辛弃疾

郁孤台下清江水，
中间多少行人泪。
西北望长安，
可怜无数山。
青山遮不住，
毕竟东流去。
江晚正愁余，
山深闻鹧鸪。

77 泊船瓜州王安石

京口瓜洲一水间，
钟山只隔数重山。
春风又绿江南岸，
明月何时照我还？

78 己亥杂诗龚自珍

九州生气恃风雷，
万马齐喑究可哀。
我劝天公重抖擞，
不拘一格降人才。

79 闻官军收河南河北杜甫

剑外忽传收蓟北，
初闻涕泪满衣裳。
却看妻子愁何在，
漫卷诗书喜欲狂。
白日放歌须纵酒，
青青作伴好还乡。
即从巴峡穿巫峡，
便下襄阳向洛阳。

80 春夜喜雨杜甫

好雨知时节，
当春乃发生。
随风潜入夜，
润物细无声。
野径云俱黑，
江船火独明。
晓看红湿处，
花重锦官城。

Level4 Unit1 Part3 Listening

Harry is an American businessman.
His job requires him to do a lot of traveling.
He takes 9 or 10 trips a year.
In the past six months he has made 5 trips.
Three were to Asia and two were to Europe.
The purpose of these trips is to attend meetings and make presentations.
Harry loves to travel, and he’s traveled to many countries.
Most of his trips are for one or two weeks.
His first international trip was 15 years ago when he was 20 years old.
He really wanted to see Asia, so he and a friend flew to Tokyo, Japan.
From Tokyo, they traveled around Japan for two weeks.
The people they met were very nice, but most of them didn’t speak English.
Harry tried to speak a little Japanese, but it was difficult.
He didn’t do very well.
When he spoke to people, most of them just looked at him.
They didn’t understand what he was trying to say.
From Japan, they went to Korea for a week, and then they went to China.
In China, they visited the Great Wall, near Beijing.
They stayed in Beijing for a few days, and then boarded a train for Shanghai.
It was an overnight train with sleeping cars. car 车厢
During the journey, they enjoyed looking out the window at the countryside.
The view from the train was wonderful.
Harry will never forget watching the sun go down in the evening.
It was a beautiful sunset.
The journey to shanghai, took many hours, but it was an unforgettable experience.
On the train, they met a chinese professor who spoke English.
He was a middle-aged man whose hair was turning grey.
He told them about how things were changing in china.
It was wonderful to watch him as he was speaking.
His eyes were full of energy and excitement.
They only stayed in shanghai for a couple of days.
Then they returned to the US and went back to school.
They had one more year to finish their studies.
Harry‘s next few trips were to different parts of the world.
He went to Europe twice, each time to different countries.
On one trip, he traveled through the UK and France.
On the next trip, he went to Italy and Greece.
After Europe, he traveled to Mexico and South America.
In south America, he went to Argentina and Brazil.
He enjoyed watching some great soccer matches.
Then he decided to go back to Asia.
But this time he went to southeast Asia.
He visited Vietnam, Thailand and Singapore.
Each country had a charm of its own.
After all this travel, Harry decided to make travel part of his career.
He didn’t want to work only in the US.
He didn’t want to work only with Americans.
He wanted to experience other countries and other cultures.
His dream was to work for an international company.
Five years ago his dream came true.
Now he’s working for a German hi-tech company.
As part of his job, he has to travel a lot.
As a result, he has been to many cities and countries.
And he has met many interesting people.

Level4 Unit1 Part3 Vocabulary

A dental cavity is a hole in the tooth.
A cavity is caused by bacteria in the mouth.
Brushing your teeth frequently and regularly can help prevent cavities.
A cracked tooth can be caused by biting down on something hard.
Dentists treat a cracked tooth by covering it with a crown.
A dental x-ray is a picture of your teeth and gums.
An x-ray shows what can’t be seen on the surface of the teeth and gums.
Braces are used by dentists to straighten teeth over a period of years.
Though braces are usually for children, they can also be used for adults with crooked teeth.
To extract a tooth, means to remove it from the mouth.
Dentists have to pull hard to extract a tooth.
(Dentists often inject something into the gum to block the pain during the extraction process.)
The heart pumps blood to all parts of the body through a system of arteries and veins.
It’s located in the chest, between the lungs, and beats about once per second.
The kidneys remove waste and toxins from the blood.
They are bean shaped organs and are about 10 centimeters long and 6 centimeters wide.
The lungs exchange oxygen from the air with carbon dioxide from the blood.
They expand when inhaling air, and contract when exhaling air.
The stomach is below the heart, and it’s part of the digestive system.
It uses acids to digest food before passing it to the small intestine.
The bladder is a balloon shaped organ that collects urine from the kidneys.
In an adult, the bladder can hold about half a liter of urine.

Level4 Unit1 Part3 Dialogue

Good evening, sir.
You were driving too fast.
Really? was I?
Yes, you were going well above the speed limit.
I’m sorry, officer.
OK, I need to see your driver’s license.
Here is my driver’s license.
Your license has expired.
Are you aware of that?
No, sir. that’s a surprise.
I didn’t know.
It expired more than a year ago.
Is this your car?
No, sir. It’s a friend’s.
I’m borrowing it for the night.
Get out of the car and put your hands behind your back.
Why, officer? What have I done?
Just do as I say.
OK, officer. I’m cooperating.
Please don’t push me.
Get your hands behind your back.
OK, OK.
I’m not asking you.
I’m ordering you.
Please. officer.
I haven’t done anything wrong.
Stay still and don’t say anything.
This is a stolen car. are you aware of that?
Are you going to arrest me?
What do you think?
That’s what we do with car thieves.
If you let me go, I’ll give you a couple of thousand dollars.
I haven’t hurt anybody.
So now you are trying to bribe me.
How stupid can you be?
I just don’t want to go back to jail.
Give me a break.
Sure. you are a nice guy.
I’d like to give you a break.
But there is nothing I can do.
Please. officer.
OK, where is the money?
Let me see it and I’ll think about it.

Level4 Unit1 Part1 Listening

Christina is on a two-week vacation.
This is the first vacation she has had for a long time.
The last vacation she took was more than two years ago.
Now she is visiting a friend in San Francisco.
Her friend and her husband are living near the center of the city.
He works for a start-up company in Silicon Valley.
While he is working, she works part-time at a department store.
Christina hasn’t seen her friend for a long time.
The last time they saw each other was 3 years ago.
At that time, they were both working at a department store.
Then Christina quit her job and started her own business.
She designs women’s clothing.
She has 2 employees now and her company is slowly growing.
Christina has come to San Francisco by herself .
Her husband didn’t come because he has to work.
He tried to start a company 2 years ago but it didn’t work out.
His company failed after only a few months.
So now he’s working at another company and saving money.
Once he saves enough money he plans to start another company.
He doesn’t want to give up.
This is the second time Christina has been to San Francisco.
The first time was when she was a high school student.
That was more than 10 years ago.
During that trip she was only in San Francisco for a few days.
After that she went to Los Angeles and New York.
This time she and her friend plan to relax and have fun.
Christina arrived two days ago, the day before yesterday.
Her friend met her at the airport and drove her to her apartment.
Her apartment is just North of the airport about 20 minutes from San Francisco.
It’s a small apartment, but it’s on a hill and it has a great view.
Yesterday they went downtown and rode the cable cars.
Christina was surprised by how steep the hills are.
Then they walked along the ocean and ate lunch at a seafood restaurant.
From the restaurant, they could see the Golden Gate Bridge.
Tomorrow, they’re planning to drive to Yosemite National Park.
By car,it’s about 4 hours away.
Christina has never been there before, so she is excited.
She has heard that the park is very beautiful.
Her friend has been to Yosemite several times.
She says it’s one of the most beautiful places in the world.
Christina just hopes that her friend is a good driver.

Level4 Unit1 Part1 Vocabulary

Headaches can be very painful and can last for a long time.
If you have a headache, your head hurts.
A sprained ankle can be so painful that you can’t walk.
Someone with a sprained ankle may need to use crutches to walk.
If you have a sore throat, it may be painful to swallow.
A sore throat can be caused by viruses or bacteria.
A burn is an injury to the skin caused by fire or heat.
If you get too close to a fire, you will be burned.
An earache is a sharp, dull or burning pain in the ear.
Common causes of an earache include an infection, a changing air pressure or water in the ear.
Mountains are landforms higher than 2 thousand feet or about 600 meters above sea level.
Hills are like mountains, but not as tall.
Mountains are formed by forces deep within the Earth and are made of many types of rocks.
Rivers are streams of water that usually begin at mountains and flow into the sea.
Many early cities were built alongside rivers.
Most of the world’s water is in the oceans, which are large bodies of salt water.
The oceans are also an important source of oxygen.
Deserts are areas of land that receive little or no rainfall.
The amount of rainfall in some deserts is so low that only a few plants can survive.
A valley is a low, relatively flat area between hills or mountains, often with a river running through it.
Some valleys are formed by flowing water, and others are formed by glaciers.
(Desert temperatures can range from cold at night to very hot during the daytime, often above 120 degrees F.)
(The place where a river begins is its source.)

Level4 Unit1 Part1 Dialogue

Have you eaten yet?
No, I haven’t, and I’m hungry.
Me too, let’s go out for dinner.
Where to?
What about Jones Italian?
How many times have you eaten there?
I eat there a lot.
It’s one of my favorite places.
I went there two weeks ago, and the service was terrible.
Really? then, let’s go some places else.
What do you suggest?
How about the Royal Indian?
It’s not far from here.
I’ve never heard of it, is it good?
Yes, I’ve been there several times, and I’ve never been disappointed.
OK, let’s try it.
I haven’t eaten Indian food for a long time.
You won’t be disappointed, and the prices are reasonable.
Ah~, so you mean I’m going to pay?
Well, that would certainly be nice.
What about reservations?
If we get there early enough, we won’t need them.
I hope you’re right.
Don’t worry.
If we have to wait, I’ll pay the bill.

Level4 Unit1 Part2 Listening

Today, Christina and her friend are enjoying themselves.
This morning they got up very early and drove out of San Francisco.
They crossed the Bay Bridge before the early morning commute and drove south.
Because it was so early, there were almost no cars.
After driving for an hour and a half, they stopped and had breakfast.
They ordered pancakes and coffee.
They also had some fresh fruit.
When they finished eating, it was 7 o’clock.
Then they got back into the car and drove south.
Christina wanted to listen to music, so they turned on the radio.
An hour later they stopped for gas.
They noticed that there was also a charging station for electric cars.
It’s now 1:15 and they are in Yosemite Park
They have been there for two hours, since 11:15.
They are looking at Yosemite falls, which is the highest waterfall in the Park.
The water drops a total of 740 meters from the top of the upper fall to the base of the lower fall.
In another 15 minutes they planed eat lunch at a magnificent old hotel in the park.
It was built in 1927 and has a great view.
They wanted to stay there, but they couldn’t get reservations.
To get a room at that hotel, you usually need to make reservations several months in advance.
They plan to stay in the park until around 4 o’clock .
By then they will have been in the park for nearly 5 hours.
Then they’ll get back into the car and drive back to San Francisco.
They plan to eat dinner somewhere along the way.
If the traffic isn’t too bad ,they should be back in San Francisco by 10 o’clock.
Early tomorrow morning they are going to cross the Golden Gate Bridge and go north along the coast.
From some places you can look out on the ocean and see whales and other sea life.
Christina has never seen a whale before, so she’s looking forward to it.
And tomorrow night they have something special planned.
They are going to watch a baseball game.
Christina has never seen a baseball game, but she has heard that it is very popular in the US.
And the San Francisco baseball team is one of the best.

Level4 Unit1 Part2 Vocabulary

A force is a push or a pull on an object.
A force changes the motion of a moving object.
A force can be strong or weak and it always has a direction.
The earth is a planet that goes around the sun in a circular orbit.
The speed of its motion doesn’t change, but the direction of its motion does.
The earth has a layer of gas above its surface, which helps to support life.
Atoms are the building blocks of matter.
At the center of an atom is its nucleus, which has a positive electric charge.
Outside the nucleus are electrons, which have a negative charge.
Asteroids and comets, are objects that orbit our sun, but are smaller than planets.
Asteroids that pass close to the Earth are called near-earth objects.
The layer of gases just above Earth’s surface is our atmosphere.
The atmosphere is made up of gases, such as oxygen and nitrogen.
Without an atmosphere, there would be no life on Earth.
(A force can increase or decrease the speed of an object, and it can change the direction of motion)
(If they collide with Earth they could cause an extinction event).
The two lines on the left intersect each other at a right angle, which is 90 degrees.
The two lines on the right are parallel, which means they never cross.
The adjacent sides of a rectangle are perpendicular, which means they meet at a 90 degree angle.
The opposite sides of a rectangle are equal and parallel, which means they never cross.
The area of a rectangle is the length times the width.
A circle is a two dimensional figure with a radius and circumference, which is the distance around the circle.
The area of a circle is PI R squared, well(where), R is the radius and PI is the ratio of a circle’s circumference to its diameter.
A sphere is a three dimensional figure with a radius and a volume, which is 4/3 PI R cubed.
All points on the surface of a sphere are equidistant from its center.
A right triangle is a two dimensional figure with 3 sides, two of which are perpendicular.
To find its area, multiply the length of the two perpendicular sides, A & B, and divided by two, A equals one half A B.
(A rectangle is a two dimensional figure with 4 sides)
(Pi is the ratio of a circle’s circumference to its diameter.)
(The electric force between the nucleus and the electrons holds the atom together.)

Level4 Unit1 Part2 Dialogue

Have you finished eating yet?
No,I haven’t.
Why are you in such a hurry?
I’m sorry, but you are such a slow eater.
A slow eater?
Well,I try to enjoy my food.
You just eat and swallow.
I don’t see how you can even taste it!
Ok, I’m sorry.
Do you mind if I get another glass of wine?
No, go ahead.
I don’t want you to sit there putting pressure on me.
I thought we were going to have a relaxing evening.
Yes, you are right.
I’d like to relax, but I have a lot on my mind.
Work related?
Yes, it is.
I’ve been getting some strange emails from my boss.
He wants me to cut down on my expenses.
Maybe he wants to fire me.
Is business bad?
Yes, it is. but I don’t want to talk about it.
OK, but I’m a good listener.
You can tell me if you’d like to.
Thanks,maybe some other time.
I’ll try to stop thinking about it and deal with it tomorrow.
Good idea.
You need to take a break from work.
Your health is important, and so am I.
Yes you are.
I don’t know what I would do without you.