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Why Do Some Animals Hibernate?
为什么一些动物会冬眠？
精读先不看文字，完整听一遍。
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Hibernation is not just deep sleep — it’s a controlled state of metabolic slowdown that helps animals survive food shortages and extreme cold.冬眠不只是深度睡眠，而是一种受控的新陈代谢减缓状态，帮助动物度过食物短缺和极寒天气。
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During hibernation, heart rate drops from 80 to as few as 5 beats per minute, and body temperature falls close to ambient levels.冬眠期间，心率从每分钟80次降至最低仅5次，体温也接近环境温度。
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Bears lower their metabolism by 75%, yet unlike smaller mammals, they don’t eat, drink, urinate, or defecate for months.熊的新陈代谢降低75%，但与小型哺乳动物不同，它们数月内不吃、不喝、不排尿、不排便。
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Their bodies recycle waste products: urea is converted back into proteins to prevent muscle loss — a trick scientists hope to adapt for human medicine.它们的身体能回收代谢废物：尿素被重新转化为蛋白质，防止肌肉流失——这一机制有望应用于人类医学。
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True hibernators like ground squirrels enter torpor so deeply that they must shiver intensely to warm up again — a process taking hours.地松鼠等真正冬眠的动物进入极深度蛰伏状态，需剧烈颤抖数小时才能回暖。
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Not all cold-season dormancy counts as hibernation; some frogs freeze solid and thaw unharmed thanks to natural antifreeze proteins in their blood.并非所有寒冷季节的休眠都算冬眠；有些青蛙体内含天然抗冻蛋白，可完全冻结后无损复苏。
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Climate change is disrupting hibernation timing, causing mismatches between emergence and food availability — threatening survival.气候变化正扰乱冬眠节律，导致苏醒时间与食物供应错配，威胁生存。
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Studying hibernation could lead to breakthroughs in treating obesity, diabetes, and long-duration space travel.研究冬眠可能为治疗肥胖、糖尿病及实现长期太空旅行带来突破。
精读 · 大约 10 分钟
听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。
③ 学 · 重点表达
- Studying hibernation could lead to breakthroughs in treating obesity, diabetes, and long-duration space travel. 研究冬眠可能为治疗肥胖、糖尿病及实现长期太空旅行带来突破。
- Climate change is disrupting hibernation timing, causing mismatches between emergence and food availability — threatening survival. 气候变化正扰乱冬眠节律，导致苏醒时间与食物供应错配，威胁生存。
- Hibernation is not just deep sleep — it’s a controlled state of metabolic slowdown that helps animals survive food shortages and extreme cold. 冬眠不只是深度睡眠，而是一种受控的新陈代谢减缓状态，帮助动物度过食物短缺和极寒天气。
④ 懂 · 选一选
⑤ 今天会说这一句
Studying hibernation could lead to breakthroughs in treating obesity, diabetes, and long-duration space travel.
⑥ 跟读并录音
Studying hibernation could lead to breakthroughs in treating obesity, diabetes, and long-duration space travel.
第一版：录下来、回听、再听标准音。系统打分以后再加。
⑦ 说 · 自己来一句
用今天的表达，自己说一句。
例子：Studying hibernation could lead to breakthroughs in treating obesity, diabetes, and long-duration space travel.
已记下。连续天数以后会显示在课表里。
陈老师指导
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课程开发中，敬请期待。