一个巴掌拍不响，这事儿是他俩一块儿干的。

[误] One palm claps not ---this must have been done by them both.

[正] It takes two to tango ---this must have been done by them both.

注：我们说“一个巴掌拍不响”，而西方人习惯用“探戈舞是需要两个人一块儿跳的”，但这两者的含义是那么的一致。