记住，唯一需要担心的是笑颇具传染性，另一科学事实确凿地证明了这一点。
The only concern to keep in mind is that smiling is very contagious and it is, definitely, another proved scientific fact.
记住，唯一需要担心的是笑颇具传染性，另一科学事实确凿地证明了这一点。
The only concern to keep in mind is that smiling is very contagious and it is, definitely, another proved scientific fact.
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