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Why Do We Yawn?
我们为什么会打哈欠？
精读先不看文字，完整听一遍。
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Yawning is a reflex that involves opening your mouth wide, inhaling deeply, and then exhaling slowly.打哈欠是一种反射动作，表现为张大嘴巴、深吸气，然后缓慢呼气。
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Though often linked to tiredness or boredom, people also yawn when they’re stressed, waking up, or even before athletic performance.虽然常与疲倦或无聊相关，但人在压力大、刚醒来，甚至运动前也会打哈欠。
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One widely supported theory says yawning helps cool the brain by increasing blood flow and bringing in cooler air.一种广受支持的理论认为，打哈欠通过增加血流和吸入较凉空气来为大脑降温。
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Brain temperature rises slightly during mental effort, and yawning may act like a natural thermostat to keep it stable.大脑在用脑时温度会轻微上升，而打哈欠可能像天然恒温器一样维持其温度稳定。
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Studies show people yawn more often in warmer rooms—and less when holding cold packs to their foreheads.研究表明，人在较热的房间中打哈欠更频繁；而将冷敷袋贴在额头上时则减少。
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Contagious yawning, where seeing or hearing someone yawn triggers your own, appears in humans after age four and in some apes.看到或听到别人打哈欠后自己也跟着打——这种传染性打哈欠，通常在人类四岁后及某些类人猿中出现。
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This social form of yawning may be tied to empathy and the ability to share emotional states with others.这种社交性打哈欠可能与共情能力及共享他人情绪状态的能力有关。
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People with autism spectrum conditions yawn contagiously less often, supporting the empathy connection.自闭症谱系障碍人士较少出现传染性打哈欠，这支持了打哈欠与共情相关的假说。
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Even dogs sometimes yawn after watching their owners yawn—a rare cross-species example of emotional mirroring.就连狗有时也会在看到主人打哈欠后跟着打哈欠——这是跨物种情绪镜像的罕见例子。
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Despite centuries of study, scientists still haven’t confirmed one single cause, and multiple factors likely interact.尽管已研究数百年，科学家仍未确认单一成因，多种因素很可能共同作用。
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
- People with autism spectrum conditions yawn contagiously less often, supporting the empathy connection. 自闭症谱系障碍人士较少出现传染性打哈欠，这支持了打哈欠与共情相关的假说。
- Even dogs sometimes yawn after watching their owners yawn—a rare cross-species example of emotional mirroring. 就连狗有时也会在看到主人打哈欠后跟着打哈欠——这是跨物种情绪镜像的罕见例子。
- Yawning is a reflex that involves opening your mouth wide, inhaling deeply, and then exhaling slowly. 打哈欠是一种反射动作，表现为张大嘴巴、深吸气，然后缓慢呼气。
④ 懂 · 选一选
⑤ 今天会说这一句
People with autism spectrum conditions yawn contagiously less often, supporting the empathy connection.
⑥ 跟读并录音
People with autism spectrum conditions yawn contagiously less often, supporting the empathy connection.
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：People with autism spectrum conditions yawn contagiously less often, supporting the empathy connection.
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。