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Why Do We Yawn When We’re Tired—or Even When Others Do?
为什么我们疲倦时打哈欠，甚至看到别人打也跟着打？
精读先不看文字，完整听一遍。
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Yawning cools the brain by drawing cool air deep into the sinus cavities, which then chill nearby blood vessels.打哈欠通过将冷空气吸入鼻窦腔，进而冷却附近的血管，从而为大脑降温。
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Brain temperature rises slightly before sleep and during mental fatigue, triggering yawns to restore optimal function.入睡之前或精神疲劳时，大脑温度会轻微升高，从而触发打哈欠以恢复最佳功能。
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Contagious yawning—copying others—is linked to empathy and social bonding, appearing reliably after age four.传染性打哈欠（模仿他人）与共情能力和社会联结相关，通常在四岁后稳定出现。
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People with autism spectrum traits or high psychopathy scores yawn less frequently in response to others’ yawns.自闭症谱系特质较明显或心理病态评分较高的人，对他人的哈欠反应更少。
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MRI scans show mirror neuron networks activate both when we yawn and when we watch someone else yawn.核磁共振成像显示，我们自己打哈欠或观看他人打哈欠时，镜像神经元网络均会被激活。
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Even dogs yawn contagiously after seeing their owners yawn, suggesting deep evolutionary roots in social species.就连狗在看到主人打哈欠后也会出现传染性哈欠，表明这一现象在社会性物种中具有深远的进化根源。
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Athletes sometimes yawn before competition to increase alertness and oxygenate key brain regions.运动员有时在比赛前打哈欠，以提升警觉性并增加关键脑区的供氧。
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While often tied to boredom, yawning itself reflects a healthy, responsive nervous system—not laziness or lack of oxygen.尽管常与无聊相关，打哈欠本身反映的是健康、灵敏的神经系统，而非懒惰或缺氧。
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
- Athletes sometimes yawn before competition to increase alertness and oxygenate key brain regions. 运动员有时在比赛前打哈欠，以提升警觉性并增加关键脑区的供氧。
- Contagious yawning—copying others—is linked to empathy and social bonding, appearing reliably after age four. 传染性打哈欠（模仿他人）与共情能力和社会联结相关，通常在四岁后稳定出现。
- Brain temperature rises slightly before sleep and during mental fatigue, triggering yawns to restore optimal function. 入睡之前或精神疲劳时，大脑温度会轻微升高，从而触发打哈欠以恢复最佳功能。
④ 懂 · 选一选
⑤ 今天会说这一句
Athletes sometimes yawn before competition to increase alertness and oxygenate key brain regions.
⑥ 跟读并录音
Athletes sometimes yawn before competition to increase alertness and oxygenate key brain regions.
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：Athletes sometimes yawn before competition to increase alertness and oxygenate key brain regions.
已记下。连续天数以后会显示在课表里。
陈老师指导
课程开发中，敬请期待。成人和孩子都可以先自学听读、精读。
这边的讲解音轨还在做。想先跟着老师走完固定 30 课，可以去陈老师带读社（和自学通行不是同一份会员）。
课程开发中，敬请期待。