Hayley教口語，“美中不足”用英語怎么說？

informal

fly是蒼蠅，ointment是油膏或者藥膏?？上攵⌒〉纳n蠅掉進了一缸油膏里，可不是把好好的油膏全糟蹋了嗎?由此可以推想fly in the ointment這個習(xí)慣用語必定指雖小卻攪了全局的東西或事情。

a single thing or person that is spoiling a situation that could have been very positive or enjoyable

美中不足之處;令人掃興的東西(或人)

I'm looking forward to Sunday, the only fly in the ointment being the fact that I'll have to sit next to my mother-in-law.

我期待著星期日的到來，唯一令人不快的是，到時我必須坐在丈母娘旁邊。