跟读练习: How to Find Area and Perimeter | Educational Rap for Math Curriculum - 通过视频学习英语口语
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It's the year 2060 and you're colonizing Mars.
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You're about to buy a plot of land, but you have a dog and you want to make sure he has enough space to run around.
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You also want to build a fence so he can't escape.
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So first you want to know how big the backyard is, and then you want to know how far it is around.
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To figure this out, you have to find.
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Just add the sides together and then you'll be great.
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With the area, that's the space inside.
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For a rectangle, it's lengthened with a multiply and perimeter.
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The distance around a shape.
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Just add the sides together and then you'll be great.
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Yeah, here I am on Mars, trying to find out the size of my backyard.
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Well, it's a rectangle, right?
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So what if we cut it into squares of the same size?
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That are one unit long by one unit wide.
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These are called square units.
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Add them all up.
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Surprise!
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You got 72 square units or feet cause that's the unit we're using.
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Well who has time to count squares?
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Blank times width is the quickest way to get there.
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Yeah, that's how you find the area.
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A nice little formula that'll take care of you.
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And I need to hurry cause my dog is starving.
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Let's find the area so I can feed Marvin.
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My yard is 9 feet long by 8 feet wide.
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I get the area when I multiply each side.
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9 times 8 is 72.
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But here's another way for you to think it through.
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Basically you take the rows, and figure how many square units fit inside of those.
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Yo, my backyard is wide, 8 feet, so that's 8 rows with 9 square units in each.
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So multiply the 8 rows by the 9 square units, you get 72, yup, you knew it.
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Area, that's the space inside, for a rectangle it's lengthened with a multiplied and perimeter.
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The distance around a shape, just add the sides together and then you'll be great.
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Now I've got my area for my yard on Mars, and there's plenty of room for Marvin to live large.
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But now I need a fence, cause I heard the animals on Mars could be intense.
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So I'll need the perimeter, the distance around my whole yard, how do you get it?
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You just add up the length of the sides.
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9 plus 8 plus 8 plus 9 is a perimeter of 34 feet, and oh yeah, that's regular units and not units squared.
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So let's take a look from another angle to get the perimeter of a square or rectangle.
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You add 2 widths plus 2 lengths.
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Here's a formula, don't forget to say thanks.
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2 times length plus 2 times width to get a square or rectangle's perimeter quick.
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So let's try it with my Martian backyard.
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Come on, get ready, y 'all.
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It's not that hard.
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Two times the length of 9 is 18.
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And two times the width of 8 is 16.
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And 16 plus 18 is 34.
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Now if I could stop Marvin from making a dirty floor.
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Seriously.
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本课的词汇与口语要点
这节 B1 级别的口语课以视频“How to Find Area and Perimeter”为素材。 视频中反复出现的词有：unit, square, perimeter, plus, add。 这段视频共有 50 个句子、501 个单词可供跟读。 讲话部分时长为 3:11。 说话人语速自然，每分钟约 157 个词，接近日常对话。 84% 的单词属于英语最常用的 3,000 词，其余的词建议在练习前先学一下。
视频中的重点词汇
视频中最难的 12 个单词，附发音和释义：
| 单词 | 发音 | 释义 |
|---|---|---|
| perimeter 名词 | /pɪˈɹɪm.ɪ.tə/ | 周邊 /周边 |
| width 名词 | /ˈwɪtθ/ | 寬度 /宽度 |
| backyard 名词 | /bækˈjɑːd/ | 後院 /后院 |
| formula 名词 | /ˈfɔː.mjʊ.lə/ | 公式 |
| fence 名词 | /fɛns/ | 籬笆 /篱笆, 柵欄 /栅栏 |
| angle 名词 | /ˈæŋ.ɡəl/ | 角, 角度 |
| hurry 动词 | /ˈhʌ.ɹi/ | 趕工 /赶工, 忙 |
| starve 动词 | /stɑɹv/ | 餓死 /饿死 |
| multiply 动词 | /ˈmʌltɪplaɪ/ | 增長 /增长 |
| rectangle 名词 | /ˈrɛktæŋɡl̩/ | 長方形 /长方形, 矩形 |
| lengthen 动词 | /ˈlɛŋθən/ | 加長 /加长 |
| colonize 动词 | /ˈkɑlənaɪz/ | 拓殖, 殖民 |
视频中出现的短语动词
| 单词 | 释义 |
|---|---|
| find out 动词 | 找出, 查明 |
| run around 动词 | 忙碌, 奔忙 |
视频中的语法
说话人最常用的结构，并附上视频中的原话：
| 结构 | 视频中的用法 |
|---|---|
| “will” 表将来 will + 动词 — 决定、承诺或预测 | you'll be · that'll take · I'll need |
| 现在进行时 am/is/are + -ing — 此刻或近期正在发生的事 | you're colonizing · we're using · is starving |
| 义务：must / have to / need to 表示某事是必要的 | have to find · need to hurry |
需要注意的发音
说话人用了 11 次缩略和弱读形式，例如 you'll, you're, can't。请按听到的简短形式来说。
- “th” 音: width /ˈwɪtθ/, lengthen /ˈlɛŋθən/
中文母语者容易读错的音：
- 词尾辅音 — 要读清楚，后面不要加元音: width /ˈwɪtθ/, backyard /bækˈjɑːd/, fence /fɛns/, intense /ɪnˈtɛns/, blank /ˈblæŋk/
- /æ/ — 嘴张大，不要读成 /e/: backyard /bækˈjɑːd/, angle /ˈæŋ.ɡəl/, blank /ˈblæŋk/, rectangle /ˈrɛktæŋɡl̩/
如何用这段视频练习
- 先完整听一遍视频，不要开口，记下不认识的单词。
- 先用 0.75 倍速逐句跟读，熟练之后再回到正常速度。
- 录下自己的声音并与原声对比，特别注意 perimeter, width, backyard 这类单词。
什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。