"Your best is not good enough"这句话是说“你的最好还不够好。 当你说你已经尽了力了，但是别人觉得你尽力的结果让人不满意，别人就可以说，"Your best is not good enough." 这句话多少有些责备别人的意思。要想责备自己，可以说，"My best is not good enough."

Bush's best is not good enough.

尽力做某事：

try one's best to do something.

try one's hardest to do something

try one's utmost to do something

不遗余力去做某事:

spare no efforts to do something.

bend every effort to do something.

另外一个短语也是和尽力有关“put your best foot forward" - 踢就要踢得漂亮，把你最好的一面表现出来。

有时候，我们做一件很难的事情不一定能成功，但是如果是已经尽力，就可以问心无愧了。

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