跟讀練習: How Long Can You Balance a Pencil? - 通過影片學習英語口語
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24 句
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1
Balancing a pencil or any other top -heavy object on its tip is quite a precarious task.
2
It's easy to see why top -heavy objects are unstable.
3
They just want to fall down.
4
Any little nudge will put it off balance, with gravity happy to pull its center of mass even more off balance.
5
And the more off balance it is, the more gravity pulls until...
6
Physicists call this kind of tipping an inverted pendulum, because it's kind of like an upside -down pendulum.
7
And, careful mathematical analysis of inverted pendulums will tell you the obvious.
8
They're really unstable.
9
In fact, these equations predict that
10
if a perfectly balanced pencil with a perfectly sharp tip were
11
to get nudged off -balance by just one ten -thousandth the width of an atom, it would take only three seconds to fall over.
12
There are indeed acrobats who can balance poles with other acrobats on top, and robots that can balance and catch and throw upright sticks,
13
and people who make seemingly impossible artistic rock stacks.
14
But in all these cases, keeping the objects balanced either requires an active stabilization effort, or else carefully taking advantage of the fact that the balancing point isn't actually a point.
15
So the question is this, can you balance a pencil sharpened to a perfect single atom -wide tip on its tip without active stabilization?
16
Well, to start, you'd better get rid of all the air bumping off the sides of the pencil, since the kinetic energy of a typical oxygen molecule is enough to destabilize the pencil.
17
Remember, if the pencil gets off -center by even one ten -thousandth the width of an atom, it'll fall down in under three seconds.
18
And you'd better cool the pencil and table down as close to absolute zero as you can, since the thermal jiggling of their atoms when they're hotter will similarly jiggle the pencil off -balance.
19
But even then, matter at very small scales has a spread -out, wave -like nature, which means you can't have both the pencil perfectly upright and not moving at the same time.
20
And while this quantum effect is never a real -life inhibitor of precarious pencil balancing, it means you never even could succeed.
21
However, it's still fun to see how long you can keep a pencil balanced on your fingertip.
22
The shorter the pencil, the harder it is.
23
My best time for a standard 19cm pencil was 1 .3 seconds.
24
Think you can beat it?
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本課的詞彙與口語要點
這節 C1 級別的口語課以影片“How Long Can You Balance a Pencil?”為素材。 影片中反覆出現的詞有：pencil, balance, atom, tip, pendulum。 這段影片共有 24 個句子、413 個單詞可供跟讀。 講話部分時長為 2:01。 說話人語速較快，每分鐘約 204 個詞，會出現較多連讀和弱讀。 只有 78% 的單詞屬於英語最常用的 3,000 詞，詞彙難度較高。
影片中的重點詞彙
影片中最難的 15 個單詞，附發音和釋義：
| 單詞 | 發音 | 釋義 |
|---|---|---|
| pencil 名詞 | /ˈpɛnsəl/ | 鉛筆 /鉛筆 |
| atom 名詞 | /ˈætəm/ | 原子 |
| pendulum 名詞 | /ˈpɛnd͡ʒələm/ | 鐘擺 /鐘擺, 擺 /擺 |
| acrobat 名詞 | /ˈæk.ɹə.bæt/ | 雜技演員 /雜技演員, 馬戲演員 /馬戲演員 |
| invert 動詞 | /ɪnˈvɜɹt/ | 反轉, 倒轉 |
| precarious 形容詞 | /pɹɪˈkɛəɹi.əs/ | 危險的 /危險的 |
| stabilization 名詞 | /ˌsteɪ.bəl.ɪzˈeɪ.ʃən/ | 穩定化 /穩定化, 安定化 |
| upright 形容詞 | /ˈʌpɹaɪt/ | 筆直 /筆直 |
| width 名詞 | /ˈwɪtθ/ | 寬度 /寬度 |
| destabilize 動詞 | /diːˈsteɪbɪlaɪz/ | 動搖 /動搖 |
| fingertip 名詞 | /ˈfɪŋɡɚˌtɪp/ | 指尖 |
| kinetic 形容詞 | /kɪˈnɛtɪk/ | 運動的 /運動的, 動的 /動的 |
| physicist 名詞 | /ˈfɪzɪsɪst/ | 物理學家 /物理學家 |
| sharpen 動詞 | /ˈʃɑɹpən/ | 磨, 削尖 |
| molecule 名詞 | /ˈmɑ.lɪ.kjul/ | 分子 |
影片中出現的短語動詞
| 單詞 | 發音 | 釋義 |
|---|---|---|
| fall down 動詞 | /fɔl ˈdaʊn/ | 落下, 倒下 |
需要注意的發音
說話人用了 7 次縮略和弱讀形式，例如 they're, you'd, can't。請按聽到的簡短形式來說。
- “th” 音: thousandth /ˈθaʊzən(d)θ/, width /ˈwɪtθ/, thermal /ˈθɜːməl/, mathematical /ˌmæθ(.ə)ˈmæt.ɪ.kəl/
- “sh” 和 “zh” 音: stabilization /ˌsteɪ.bəl.ɪzˈeɪ.ʃən/, sharpen /ˈʃɑɹpən/, equation /ɪˈkweɪ.ʒən/
- 長單詞——注意重音位置: precarious /pɹɪˈkɛəɹi.əs/, stabilization /ˌsteɪ.bəl.ɪzˈeɪ.ʃən/, destabilize /diːˈsteɪbɪlaɪz/, inhibitor /ɪnˈhɪbɪtɚ/, mathematical /ˌmæθ(.ə)ˈmæt.ɪ.kəl/
如何用這段影片練習
- 先完整聽一遍影片，不要開口，記下不認識的單詞。
- 先用 0.75 倍速逐句跟讀，熟練之後再回到正常速度。
- 錄下自己的聲音並與原聲對比，特別注意 pencil, atom, pendulum 這類單詞。
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。