Afterwards, "to turn pale at the mention of a tiger" is used to refer that somebody becomes extremly nervous when he is informed of something that he once fell victim before.

后来，“谈虎色变”就用来比喻一提到可怕的事就情绪紧张起来，连脸色都变了。

youdao

Hamlet said to himself, "If Claudius is really guilty, his face will turn pale while he is watching the play."

哈姆雷特对自己说：“假如克劳迪斯真的有罪，当他在观赏这出戏时，他的脸将会变得苍白。”

youdao

The further off from England the nearer is to France-- Then turn not pale, beloved snail, but come and join the dance.

如果你更远地离开英格兰，就会更加接近法兰西。 亲爱的蜗牛，不要害怕，赶快去把舞会参加。

youdao

So while you're sitting around with the other patients in your pajamas and everybody's pale and thin and you're waiting for your turn to get the gamma rays, you think about a lot of things.

CNN: You are the creative type