跟讀練習: 3.3k - 通過影片學習英語口語
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Hey everyone, I'm Bull and I'm here to serve you today's slice of pie.
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Today's topic is list comprehension.
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So let me give you a scenario.
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Let's say you have a long list of numbers here called nums
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and what you want to do is get all the even numbers from this list and put them into this evens list.
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If you have no knowledge of list comprehension, you may want to do something like this where you create a for loop and say for num in nums.
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So for each for loop iteration, we take an item from this nums list and assign it to num.
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Then in here, we need to check if that particular num is even or not.
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We can do this with the modulus operator.
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So let's say num percent two.
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This percent sign is the modulus operator.
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What this is doing is saying if I divide num by two, what will the remainder be?
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So for every possible whole number, if you do a modulus of that number, you will only ever get a zero or a one.
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Even numbers divided by two give you a zero as a remainder and odd numbers give you a one.
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So if num modulus two is equal to 0, we know that particular number is even.
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So in here, let's add it to our evens list.
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So we can just do evens.append num.
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And that's it.
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Down here, let's print our evens list, and this should work as expected.
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Okay, but list comprehension can do all of this logic in a much cleaner pythonic way.
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So I'll erase this, and instead, in this evens list, I'll say num for num in nums.
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So this is basically just taking each num in our nums list and placing it here in this evens list.
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But this isn't what we want.
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We're only wanting the even numbers.
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Well, we can add some additional logic here at the end to fix this.
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Let's say num for num in nums if that particular num, modulus 2, is equal to 0.
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Now we should have every even number placed in this evens list.
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So let's run this, and there we go.
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Pretty cool, right?
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Be sure to leave a like if you found this helpful.
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背景與上下文
在這段影片中，講者Bull向觀眾介紹了一種強大的Python程式設計技巧——列表推導（list comprehension）。他通過一個示例，展示如何從一組數字中篩選出偶數，並解釋了相關的邏輯和語法。這種技巧不僅提高了程式碼的清晰度，還增強了程式設計的效率。對於希望通過看YouTube學英語來提升語言能力的學習者來說，理解程式設計相關的英語表達，可以幫助他們在技術領域更有效地溝通。
日常交流中的五個重要短語
- list comprehension - 列表推導：一種簡潔的方法來建立新列表。
- for loop - 迴圈：用於遍歷一個序列中的每一個元素。
- modulus operator - 取模運算子：用於計算兩個數相除後的餘數。
- remainder - 餘數：除法運算中剩下的部分。
- append - 新增：向列表末尾增加新元素的操作。
逐步跟讀指南
要順利掌握影片中的內容和相關英語表達，建議遵循以下步驟進行shadowspeak練習：
- 初步觀看：第一次觀看時，集中注意力在講者的口音、語速和手勢上，儘量理解大意。
- 文本跟讀：找出影片的簡要文本或生成字幕，逐句跟讀，模仿講者的發音和語調，這對於提高你的shadowspeaks技巧大有裨益。
- 分段練習：將影片內容分為幾個小段，反覆練習每個段落，直到熟悉為止。尤其是涉及技術術語的部分，如list comprehension和modulus operator。
- 多次復聽：在練習口語時，多次回放影片，並嘗試用自己的話表述相同的內容，這有助於鞏固記憶。
- 與他人交流：通過線上小組或語言交流活動，將你學到的知識與他人分享，討論這些表達的使用場景，提升語言應用的自信心。
通過以上方法，你可以更高效地提高英語口語能力，同時深入理解技術領域的術語和表達，讓英語學習變得更為活潑有趣！
影片中的語法
說話人最常用的結構，並附上影片中的原話：
| 結構 | 影片中的用法 |
|---|---|
| “will” 表將來 will + 動詞 — 決定、承諾或預測 | will the · will only ever get · I'll erase |
| 現在進行時 am/is/are + -ing — 此刻或近期正在發生的事 | is doing · We're only wanting |
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。