Professor Paul Bloom: I don't know if that's--The question is, "Is there a difference between smiling with your teeth versus just your lips closed?"
我不知道是否,问题是,微笑露齿与不露齿有不同吗“
This characteristic thing we do with our lips exposing our teeth and so forth.
这种特有的,咧嘴露齿的动作
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