do everything in one's power;contribute according to one's ability;do one's best;do ... to the best of one's capabilities;do the best one can ;

I can't promise you the moon, but I'll do the best job I can.
我不能对你作无法兑现的许诺, 但我将尽力而为.
来源:《现代汉英综合大词典》" They should be smart enough to figure that out themselves. Mention it, don't insist.
“ 他们自己本该想到这一点. 提是可以提一下, 但不要坚持,到时候咱们尽力而为就行了.
来源:教父部分Don't leave a stone unturned. It's always something , to know you've done the most you could.
千方百计去做吧, 知道自己已经尽力而为,对自己是一种安慰.
来源:《现代汉英综合大词典》" I'll try to,'said Bob smiling, and edging closer to Carrie.
“ 我会尽力而为, " 鲍勃含着笑说, 挨近嘉莉一些.
来源:英汉文学 - 嘉莉妹妹
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