A small discrepancy leads to a great error.
One False step will make a great difference.
失之毫厘，谬以千里。(两种说法)
discrepancy [ˌdɪsˈkrepənsi] 名词，差异
discrepant [disˈkrep(ə)nt] 形容词，有差异的
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How to express 失之毫厘，谬以千里 in English?
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