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in vain
01
徒劳地, 无益地
without success or achieving the desired result
Example
Despite hours of searching, the lost keys were found in vain, and she had to get a spare set.
尽管找了几个小时，丢失的钥匙徒劳地被寻找，最后她不得不拿出一副备用钥匙。
He tried to convince them to change their decision, but his efforts were in vain, and the plan proceeded as initially intended.
他试图说服他们改变决定，但他的努力徒劳地，计划照原定进行。
