跟读练习: 3.3k - 通过视频学习英语口语

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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.

背景与上下文

在这段视频中，讲者Bull向观众介绍了一种强大的Python编程技巧——列表推导（list comprehension）。他通过一个示例，展示如何从一组数字中筛选出偶数，并解释了相关的逻辑和语法。这种技巧不仅提高了代码的清晰度，还增强了编程的效率。对于希望通过看YouTube学英语来提升语言能力的学习者来说，理解编程相关的英语表达，可以帮助他们在技术领域更有效地沟通。

日常交流中的五个重要短语

  • list comprehension - 列表推导：一种简洁的方法来创建新列表。
  • for loop - 循环：用于遍历一个序列中的每一个元素。
  • modulus operator - 取模运算符：用于计算两个数相除后的余数。
  • remainder - 余数：除法运算中剩下的部分。
  • append - 添加：向列表末尾增加新元素的操作。

逐步跟读指南

要顺利掌握视频中的内容和相关英语表达，建议遵循以下步骤进行shadowspeak练习：

  1. 初步观看：第一次观看时，集中注意力在讲者的口音、语速和手势上，尽量理解大意。
  2. 文本跟读：找出视频的简要文本或生成字幕，逐句跟读，模仿讲者的发音和语调，这对于提高你的shadowspeaks技巧大有裨益。
  3. 分段练习：将视频内容分为几个小段，反复练习每个段落，直到熟悉为止。尤其是涉及技术术语的部分，如list comprehension和modulus operator。
  4. 多次复听：在练习口语时，多次回放视频，并尝试用自己的话表述相同的内容，这有助于巩固记忆。
  5. 与他人交流：通过线上小组或语言交流活动，将你学到的知识与他人分享，讨论这些表达的使用场景，提升语言应用的自信心。

通过以上方法，你可以更高效地提高英语口语能力，同时深入理解技术领域的术语和表达，让英语学习变得更为活泼有趣！

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。