The term " trash talk" is a set expression.

" trash talk" 是一个固定短语。

It's a set expression, and it's very descriptive.

这是一个固定搭配，说明性非常强。

He was standing motionless with a set sullen expression on his face.

他一动不动地站在原地， 脸上带着一副阴沉的表情。

Well, it's just a set idiom, it's a set expression.

好吧，这只是一个固定的成语，它是一个固定的表达。

So this is the whole idea of mixing conditionals and getting the idea across, without having a very set expression.

所以这就是混合条件句并在没有非常固定的表达的情况下传达想法的整个想法。

And I say: " Well, there's no real reason to." Like: " Why do people say 'all set'? " Well, it's just a set expression.

比如：“为什么人们说‘一切就绪’？ ” 好吧，这只是一个固定的表达方式。

Yet the white face and set expression of the young hunter showed that in his approach to the house he had seen enough to satisfy him upon that head.

在他爬近这个屋子的时候，早已把这里的险恶情况，看得一清二楚了。

The man's face was set in hard, stern lines and the marks of sorrow were writ deep about his mouth and eyes-so deep that the set expression of rage upon his features could not obliterate them.

男人的脸上刻着坚硬、严厉的线条，他的嘴巴和眼睛上写满了悲伤的痕迹——如此之深，以至于他脸上固定的愤怒表情无法抹去它们。