跟读练习: How does extreme heat affect your body? - Carolyn Beans - 通过YouTube学习英语口语
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The year is 2050 and your morning is not off to a good start.
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The year is 2050 and your morning is not off to a good start.
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School is closed for yet another heat day, meaning the kids need to stay home and the AC needs to stay on.
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Your usual babysitter can’t come help because the rails for their commuter train were warped by the heat.
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And to make matters worse, your dog is desperate for a walk, but the pavement is hot enough to give third degree burns to any paw or person that touches it.
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In many parts of the world, this sweltering future is already here.
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On average, heat waves are happening more often with greater intensity and for longer durations.
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But according to a 2022 projection, by 2050, Earth’s mid-latitudes could be experiencing extreme heat between 90 and 180 days a year, with tropical regions enduring even more.
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So, how hot is too hot, and what can people do to handle the heat?
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While human bodies are decent at managing temperature, our cooling mechanisms only work under the right conditions.
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When air temperatures climb, the hypothalamus tells blood vessels near the skin to widen, allowing more blood to flow near the body's surface and release heat.
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This hormonal cascade also turns on our sweat glands.
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As sweat evaporates, it pulls the heat from our skin.
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But if humidity is high, the rate of evaporation slows and eventually stops.
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Scientists use this principle to track humidity with a metric called wet-bulb temperature, in which they wrap a wet, room temperature cloth around a thermometer to see if evaporation will lower the reading.
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If it doesn't, it's too humid for sweat to cool us off.
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A wet-bulb temperature of roughly 35°C is generally considered the limit of human survival, though current temperatures rarely reach this threshold.
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The US National Weather Service uses the relationship between humidity and air temperature as the basis for their heat index.
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As those two metrics rise, so too does the heat index; and heat is considered dangerous if the index climbs above 39.4°C.
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That’s 103°F.
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But even a lower heat index can be hazardous over multiple days.
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A heat wave is a streak of two or more days of unusually hot weather for a place and season.
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For example, a string of 32°C days in Houston, Texas, is standard in the summer, but would constitute a heat wave in March.
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And the impact of these events touches nearly every aspect of daily life.
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Imagine a June heat wave strikes a tropical city.
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The first to experience effects are outdoor workers.
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Their excessive sweating leads to dehydration and muscle pain known as heat cramps.
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If they push on, their conditions could worsen to heat exhaustion and even heat stroke— a life-threatening ailment that occurs when a body’s temperature exceeds 40°C.
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Medical emergency calls spike across the city, often for children and people who are pregnant or elderly.
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The heat also increases hospital visits for heart, kidney, and lung-related conditions, creating an influx of patients that threatens to overwhelm medical providers.
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Over the following week, the city slows to a crawl.
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Schools and construction sites close.
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Airplanes need to reduce their weight limits to take off, bumping countless travelers from their flights.
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Restaurants shut down as overheated kitchens become unbearable.
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Residents who remain inside with air conditioners stay safe.
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But blasting AC isn’t cheap, and many families have to choose between keeping cool and staying fed.
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Either way, if the heat continues, the stress of these air conditioners could overwhelm the power grid, potentially leading to city-wide outages.
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These consequences are all very real.
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Each year, close to 500,000 people die due to excessive heat, and these extreme conditions are only growing more common.
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We can limit medical impacts by seeking help for heat-related illnesses, staying hydrated, and keeping people cool through public access to water and AC.
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But don’t let anyone tell you 1 to 2 degrees doesn’t matter.
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It will change our very way of life.
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背景與脈絡
在這段影片中，主講者卡羅琳·賓斯（Carolyn Beans）探討了極端高溫如何影響人類的身體。她指出，隨著氣候變化的加劇，熱浪的頻率和強度將持續上升，並引發一系列健康問題。這段對話不僅引人深思，還提供了重要的生存知識，提醒我們如何在這樣的環境中保護自己。
日常交流的五個關鍵短語
- “在高溫下工作” — Understanding the impact of heat on outdoor workers.
- “保持水分” — Emphasizing the importance of hydration during heat waves.
- “過熱的廚房” — This phrase highlights challenges faced in restaurant settings during extreme heat.
- “電網壓力” — Referring to the stress on energy resources as air conditioning usage spikes.
- “醫療急救” — Recognizing the need for medical assistance during heat-related illnesses.
逐步跟讀指導
在學習如何應對影片中的困難時，您可以採用以下步驟來提升自己的英语口语练习能力：
- 觀看影片 — 首先，請在看YouTube学英语平台上觀看此影片，注意發音和語調。
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- 錄音對比 — 自己錄音，然後與影片的原聲進行對比，找出需要改進的地方。
- 實際運用 — 將學到的短語和句子應用到您自己的對話中，參與一些雅思口語练习的討論，以增強信心。
持續進行這種跟讀練習，有助於提升您在真實生活中的英语口语练习技能，讓您在面對任何話題時都能流利應對。
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。