Culture and Discovery

Can you catch a yawn?

作者：21ST

打哈欠为什么会传染？

词数 353 建议阅读时间 7分钟教案和课件见网站测试见7版

IT happens all the time. As soon as you see or hear someone yawn (打哈欠), you cannot help but do it too. It is clear to see that yawning is contagious (有感染力的).

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