She was such a wet blanket¹ at the party that they never invited her again. 她在那次聚会扫了大家的兴,之后再也没人邀请她了.

扫兴的人到处都有,而在英文里,用wet blanket就可以表达这个意思.

Let's not invite Dick to the dance--he is such a wet blanket with that sour look on his face and his boring talk. 我们开舞会可别请迪克,他那愁眉苦脸的样子,还老说那些没有人感兴趣的话,太扫兴了.

We lead a very happy life here. The only fly in the ointment² is that there's too much traffic on our road. 我们在这儿过得很快活,唯一美中不足的就是住处旁边马路上的车辆太多了.

a fly in the ointment,意思是"扫兴的人,煞风景的事物". a person or thing that stops a situation, activity, plan from being³ as good or successful as it could be。