跟读练习: Can you solve the prisoner hat riddle? - Alex Gendler - 通过YouTube学习英语口语
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You and nine other individuals have been captured by super intelligent alien overlords.
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You and nine other individuals have been captured by super intelligent alien overlords.
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The aliens think humans look quite tasty, but their civilization forbids eating highly logical and cooperative beings.
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Unfortunately, they're not sure whether you qualify, so they decide to give you all a test.
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Through its universal translator, the alien guarding you tells you the following: You will be placed in a single-file line facing forward in size order so that each of you can see everyone lined up ahead of you.
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You will not be able to look behind you or step out of line.
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Each of you will have either a black or a white hat on your head assigned randomly, and I won't tell you how many of each color there are.
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When I say to begin, each of you must guess the color of your hat starting with the person in the back and moving up the line.
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And don't even try saying words other than black or white or signaling some other way, like intonation or volume; you'll all be eaten immediately.
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If at least nine of you guess correctly, you'll all be spared.
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You have five minutes to discuss and come up with a plan, and then I'll line you up, assign your hats, and we'll begin.
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Can you think of a strategy guaranteed to save everyone?
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Pause the video now to figure it out for yourself.
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Answer in: 3 Answer in: 2 Answer in: 1 The key is that the person at the back of the line who can see everyone else's hats can use the words "black" or "white" to communicate some coded information.
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So what meaning can be assigned to those words that will allow everyone else to deduce their hat colors?
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It can't be the total number of black or white hats.
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There are more than two possible values, but what does have two possible values is that number's parity, that is whether it's odd or even.
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So the solution is to agree that whoever goes first will, for example, say "black" if he sees an odd number of black hats and "white" if he sees an even number of black hats.
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Let's see how it would play out if the hats were distributed like this.
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The tallest captive sees three black hats in front of him, so he says "black," telling everyone else he sees an odd number of black hats.
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He gets his own hat color wrong, but that's okay since you're collectively allowed to have one wrong answer.
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Prisoner two also sees an odd number of black hats, so she knows hers is white, and answers correctly.
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Prisoner three sees an even number of black hats, so he knows that his must be one of the black hats the first two prisoners saw.
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Prisoner four hears that and knows that she should be looking for an even number of black hats since one was behind her.
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But she only sees one, so she deduces that her hat is also black.
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Prisoners five through nine are each looking for an odd number of black hats, which they see, so they figure out that their hats are white.
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Now it all comes down to you at the front of the line.
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If the ninth prisoner saw an odd number of black hats, that can only mean one thing.
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You'll find that this strategy works for any possible arrangement of the hats.
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The first prisoner has a 50% chance of giving a wrong answer about his own hat, but the parity information he conveys allows everyone else to guess theirs with absolute certainty.
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Each begins by expecting to see an odd or even number of hats of the specified color.
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If what they count doesn't match, that means their own hat is that color.
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And everytime this happens, the next person in line will switch the parity they expect to see.
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So that's it, you're free to go.
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It looks like these aliens will have to go hungry, or find some less logical organisms to abduct.
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背景与背景信息
在这段视频中，讲述者亚历克斯·根德勒（Alex Gendler）向观众介绍了一个令人兴奋的智力谜题——囚犯帽子谜语。故事讲述了一群被外星人捕获的人，他们必须通过猜测自己帽子的颜色来决定生死。这个谜题不仅考验了逻辑思维，还展示了团队的合作精神。通过这样的情节，学习者不仅可以锻炼他们的英语能力，还能提高解决问题的能力。
日常交流中的五个重要短语
- What color is my hat?（我的帽子是什么颜色的？）
- I see an odd number of black hats.（我看到奇数个黑帽子。）
- Make a guess.（做一个猜测。）
- You are all safe!（你们都安全了！）
- Use logic to deduce.（运用逻辑推理。）
以上短语在与他人交流时，尤其是讨论逻辑问题或复杂情境时，极为有用。这些表达方式可以帮助英语学习者在实际对话中更加自信，从而提高口语水平。
逐步影子跟读指南
对于想要提升英语发音和流利度的学习者来说，影子跟读（shadowspeak）是一种行之有效的方法。以下是基于本视频的逐步指南，帮助学习者掌握这一技巧：
- 选择视频片段：先选择视频的一小段，最好是1-2分钟，让自己不会感到压力。
- 初次观看：第一次观看时，不要试图跟读。专注于理解内容和对话的逻辑。
- 分段跟读：将视频分成小段，逐句进行跟读。听一遍后，模仿发音并注意语调。
- 重复练习：多次重复影子跟读，每次尽量提高发音的准确性和流畅度。
- 自我反馈：可以录下自己的声音，与原视频进行对比，找出改进之处。
充足的练习将使您在发音和语言流利度方面有质的飞跃。记住，持续的影子跟读练习（shadow speech）能够显著提升您的英语发音，让您在日常交流中更加自如自信。
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。