诚然，冷酷的表情有时不是出于心理原因。

Often, it is true, this air of hardness is due not to psychological causes.

youdao

我的感觉是这样的：有时他确实如此，但有时不是。

My feeling is this: sometimes he does, and sometimes he doesn't.

youdao

黑猩猩的笑有时不是表示高兴和加强社会关系，而是在乎于权威。

Chimpanzees sometimes smile not for pleasure or for a social.

youdao

So you will sometimes see as you are reading the text, they will sometimes refer to Horeb instead of Mount Sinai, or you'll see the two names used interchangeably. And it's been the theory of scholars that that's because it comes from a different source.

所以，有时在你阅读的文本中，它会提到和烈山,而不是西奈山，或者你会看到这两个名字,互换着用，根据学者的理论解释，这是因为,这两个名字来源于不同的资料。

耶鲁公开课 - 旧约导论课程节选

He is not a kind of socio-biologist of politics, although he sometimes appears this way when he says that man is a political animal.

他并不是一种政治学的社会生物学家，但他有时的确显得像,尤其是当他说到人类是政治动物时。

耶鲁公开课 - 政治哲学导论课程节选

But it's a notion that's complicated in this case by the equally imperative notion "get out of the way," which doesn't at all necessarily entail stopping but rather accelerating in a different direction.

但是值得注意，这很复杂,正如红灯有时表示别挡路,它也不是从来都只表示停止,有时也表示向相反方向前进。

耶鲁公开课 - 文学理论导论课程节选