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“

耶鲁公开课 - 心理学导论课程节选

I don't know. There's evidence that the coy smile shows up in non The question was, "Do nonhuman primates give the same smiles that humans do?

我不知道，有证据表明,腼腆微笑在非人类,问题是，灵长类和人类微笑相同吗？

耶鲁公开课 - 心理学导论课程节选