跟读练习: What is a calorie? - Emma Bryce - 通过YouTube学习英语口语
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We hear about calories all the time.
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We hear about calories all the time.
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How many calories are in this cookie?
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How many are burned by 100 jumping jacks,
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or long-distance running, or fidgeting?
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But what is a calorie really?
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And how many of them do we actually need?
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Calories are a way of keeping track of the body's energy budget.
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A healthy balance occurs when we put in about as much energy as we lose.
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If we consistently put more energy into our bodies than we burn,
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the excess will gradually be stored as fat in our cells and will gain weight.
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If we burn off more energy than we replenish, we'll lose weight.
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So we have to be able to measure the energy we consume and use,
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and we do so with a unit called the calorie.
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One calorie, the kind we measure in food,
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also called a large calorie,
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is defined as the amount of energy it would take to
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raise the temperature of one kilogram of water by one degree Celsius.
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Everything we consume has a calorie count,
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a measure of how much energy the item stores in its chemical bonds.
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The average pizza slice has 272 calories.
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There are about 78 in a piece of bread,
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and an apple has about 52.
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That energy is released during digestion
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is stored in other molecules that can be broken down to provide energy when the body needs it.
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It's used in three ways.
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About 10% enables digestion, about 20% fuels physical activity,
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and the biggest chunk, around 70%,
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supports the basic functions of our organs and tissues.
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That third usage corresponds to your basal metabolic rate,
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the number of calories you would need to survive if you weren't eating or moving around.
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Add in some physical activity and digestion,
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and you arrive at the official guidelines for how many calories the average person requires each day,
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2,000 for women and 2,500 for men.
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Those estimates are based on factors like average weight,
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physical activity, and muscle mass.
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So does that mean everyone should shoot for around 2,000 calories?
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Not necessarily.
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If you're doing an energy-guzzling activity,
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like cycling the Tour de France,
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your body could use up to 9,000 calories per day.
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Pregnancy requires slightly more calories than usual.
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And elderly people typically have a slower metabolic rate.
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Energy is burned more gradually, so less is needed.
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Here's something else you should know before you start counting calories.
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The calorie counts on nutrition labels measure how much energy the food contains,
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not how much energy you can actually get out of it.
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Fibrous foods like celery and whole wheat take more energy to digest,
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so you'd actually wind up with less energy from a 100-calorie serving of celery than a 100-calorie serving of potato chips.
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Not to mention the fact that some foods offer nutrients like protein and vitamins,
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while others provide far less nutritional value.
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Eating too many of those foods could leave you overweight and malnourished.
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And even with the exact same food,
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different people might not get the same number of calories.
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Variations in things like enzyme levels,
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gut bacteria, and even intestine length means that every individual's ability to extract energy from food is a little different.
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So a calorie is a useful energy measure,
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but to work out exactly how many of them each of us requires,
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we need to factor in things like exercise,
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food type, and our body's ability to process energy.
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Good luck finding all of that on a nutrition label.
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为何通过此视频练习口语？
通过观看和模仿Emma Bryce的视频，我们可以在轻松的环境中提高英语口语技巧。这段关于卡路里的讲解提供了轻松深入的内容，帮助我们理解饮食与健康之间的关系。不仅如此，视频中的生动表达和实际例子使复杂的概念变得易于理解，促进了我们对相关词汇和句子结构的熟悉。这是一个进行英语口语练习的绝佳机会，通过shadow speech技巧，你可以在模仿和练习中增强自信，提升口语流利度。
语法与表达的语境
在视频中，Emma使用了一些关键的语法结构，帮助我们掌握如何在医学和营养讨论中使用英语。以下是几个重要的表达：
- 可以使用的量词：“一个卡路里”作为能量单位的描述，强调了其在营养标签上的重要性。
- 比较句型：“比……更多”这类表达用于比较不同食物的卡路里含量，使听众更易理解。
- 因果句型：“如果……那么……”表达因果关系，对理解健康与饮食之间的关系至关重要。
通过练习这些结构，学习者可以更好地在语境中运用，提高挑战性对话的能力。
常见发音陷阱
在观看这段视频时，我们会遇到一些发音比较有挑战性的单词和短语，尤其对于非母语人士来说。这些包括：
- “calorie” (卡路里)：常常被发音为“栓瘤里”，注意a发音为短音，强调元音。
- “digestion” (消化)：此词的发音中有轻音，注意“g”音的连接。
- “metabolic rate” (基础代谢率)：在快速的语流中，这个短语容易被合成发音，注意每个音节的清晰发出。
通过反复模仿和练习这些发音，你将能够显著提高英语发音，并在与他人的对话中更加流畅自然。让我们一起用这些技巧来看YouTube学英语，并加强我们的口语能力！
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。