leave a nasty (or bad) taste in one's mouth
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.
A: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?
B：你是说你怀疑他?
A:I'm not sure. I'll try to prove my feeling.
A:我不敢肯定，我会设法证实的。
B:I hope I can do something for you.
B：我希望能帮上忙。