你们的微笑问题是什么？

What are your smiling questions?

youdao

她面对这样突兀的问题露出了微笑。

She smiled at the incongruity of the question.

《柯林斯英汉双解大词典》

只有心理学家才会问这样的问题：为什么我们高兴时微笑，而不是怒容满面？

The psychologist alone can ask such questions: Why do we smile when pleased and not scowl?

youdao

So, he writes: To the psychologist alone can such questions occur as: Why do we smile when pleased and not scowl?

他这样写到：,对哲学家本身说,会出现这些问题：,为什么开心时我们微笑而非皱眉？

耶鲁公开课 - 心理学导论课程节选

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