留下一个坏印象；引起反感

The whole experience left a bad taste in my mouth.

整个经历给我留下了一个非常不好的印象。

When you see someone being treated so unkindly, it leaves a bad taste in your mouth.

当你看到某些人被很恶劣地对待时，就会在你脑海中留下一个坏印象。

A:I had to announce his innocence in court today, but it left a nasty taste in my mouth.

今天我不得不在法庭上宣布他无罪，可是我心里觉得不对劲。

B:You mean you suspect him?

你是说你怀疑他?

A:I'm not sure. I'll try to prove my feeling.

我不敢肯定，我会设法证实的。