跟讀練習: This structure feels impossible to move - 通過影片學習英語口語
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24 句
如果句子過短或過長，請點選 Edit 進行調整。
1
This is a strange one.
2
It's Jessen's octahedron, infinitesimally flexible.
3
What does that mean?
4
Well, if you think about a structure like this one, if this was perfectly rigid, then there would be no movement at all.
5
But in the real world, these bars would be a little bit stretchy, which means that I can pull up on this joint.
6
And if I were to plot the lengthening of this rod against the vertical motion of the joint, it would look like this.
7
You can't move the joint without stretching the bar.
8
But what about a structure like this?
9
The curve flattens out zero movement.
10
So at the very beginning, it's possible to move that joint without the bar lengthening at all.
11
But then as soon as the joint does move, the bar will have to lengthen.
12
A structure like this is infinitesimally flexible, but because it exists in the real world, I can actually flex it.
13
And it feels like it takes no force to do so until it has traveled some distance.
14
Whereas with this structure, it feels like I can't move it at all.
15
It's easy to make an infinitesimally flexible joint.
16
You just take a straight rod and you put the joint in the middle Similarly,
17
in three dimensions, a polyhedron will be infinitesimally flexible if one of the vertices is coplanar,
18
whereas Jessen's polyhedron is able to achieve infinitesimal flexibility without having to resort to coplanar vertices.
19
When I squeeze it, I can feel air coming out.
20
And incredibly, that's actually proof that Jessen's polyhedron isn't a true flexible polyhedron.
21
Robert Connolly discovered the first proper flexible polyhedron in 1977.
22
It's this monster with 18 faces.
23
Annelly proved that the volume of a flexible polyhedron doesn't change as the polyhedron flexes.
24
It's called the bellows conjecture because a polyhedron cannot be used as bellows.
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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“This structure feels impossible to move”為素材。 影片中反覆出現的詞有：polyhedron, flexible, joint, infinitesimally, structure。 這段影片共有 24 個句子、307 個單詞可供跟讀。 講話部分時長為 1:41。 說話人語速較快，每分鐘約 182 個詞，會出現較多連讀和弱讀。 只有 75% 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 11 個單詞，附發音和釋義：
| 單詞 | 發音 | 釋義 |
|---|---|---|
| polyhedron 名詞 | /ˌpɒlɪˈhiːdɹən/ | 多面體 /多面體 |
| lengthen 動詞 | /ˈlɛŋθən/ | 加長 /加長 |
| bellows 名詞 | /ˈbɛl.oʊz/ | 風箱 /風箱 |
| coplanar 形容詞 | /kəʊˈpleɪnə(ɹ)/ | 共面 |
| vertex 名詞 | /ˈvɝˌtɛks/ | 頭頂 /頭頂 |
| conjecture 名詞 | /kənˈd͡ʒɛkt͡ʃə/ | 臆測 /臆測, 推測 /推測 |
| flatten 動詞 | /ˈflæ.tən/ | 壓平 /壓平, 壓扁 /壓扁 |
| octahedron 名詞 | 八面體 /八面體 | |
| rigid 形容詞 | /ˈɹɪd͡ʒ.ɪd/ | 硬性, 僵硬 |
| squeeze 動詞 | /skwiːz/ | 壓榨, 擠壓 /擠壓 |
| dimension 名詞 | /daɪˈmɛn.ʃən/ | 方面, 特點 /特點 |
影片中出現的短語動詞
| 單詞 | 發音 | 釋義 |
|---|---|---|
| come out 動詞 | /ˌkʌm ˈaʊt/ | 出, 出來 /出來 |
需要注意的發音
說話人用了 4 次縮略和弱讀形式，例如 can't, doesn't, isn't。請按聽到的簡短形式來說。
- 長單詞——注意重音位置: polyhedron /ˌpɒlɪˈhiːdɹən/, infinitesimal /ˌɪnfɪnɪˈtɛsɪməl/, flexibility /ˌflɛksɪˈbɪlɪti/
中文母語者容易讀錯的音：
- 詞尾子音 — 要讀清楚，後面不要加母音: bellows /ˈbɛl.oʊz/, vertex /ˈvɝˌtɛks/, flex /flɛks/, rigid /ˈɹɪd͡ʒ.ɪd/, squeeze /skwiːz/
- /r/ 和 /l/ 的區別: polyhedron /ˌpɒlɪˈhiːdɹən/, coplanar /kəʊˈpleɪnə(ɹ)/
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 polyhedron, lengthen, bellows 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。