preach to the choir
US /priːtʃ tu ðə kwaɪər/
UK /priːtʃ tu ðə kwaɪər/
1.
对牛弹琴, 向已相信的人说教
to try to persuade people to believe things that they already believe
:
•
When I talk about the importance of environmental protection to this group, I feel like I'm preaching to the choir.
当我向这个团体谈论环境保护的重要性时，我觉得我是在对牛弹琴。
•
You don't need to convince me; you're preaching to the choir.
你不需要说服我；你是在对牛弹琴。