Scientists have believed that S.I.V.did not cause a similar immune system problem for primates.

VOA: special.2009.09.08

Other primates do it to some extent and then it's interesting when they do it.

其他灵长类动物也在一定程度上有这种特性,但它们的笑很有意思。

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

Yeah.Student: Do nonhuman primates' smiles Professor Paul Bloom: That's a good question.

非人的灵长类微笑,好问题。

耶鲁公开课 - 心理学导论课程节选