a miss is as good as a mile 差之毫厘， 谬以千里

【例句】
It does not matter that you scored two marks less than her, you will not be given the prize because a miss is as good as mile.
你比她少得两分并不重要，你不会得奖的，因为差之毫厘，谬以千里。

I ran a marathon onces and can tell you that only in charitable runs a miss is not as good as a mile. Everywhere else the competition is fierce.
我跑了一次马拉松，我可以告诉你，只有在慈善赛跑中，差之毫厘，才不至于谬以千里。其他地方的竞争都很激烈。