Tag Archives | Why do we yawn? HSK 6 打哈欠是人类的一种本能行为 Yawning is an instinctive act of mankind

Why do we yawn? HSK 6 打哈欠是人类的一种本能行为 Yawning is an instinctive act of mankind

Why do we yawn? HSK 6 打哈欠是人类的一种本能行为 Yawning is an instinctive act of mankind

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