once

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【释义】：

ad．❶ 一次，一回：more than once 不止一次．once more再一次．once in every six months每六个月一次．I have seen him once．我曾见过他一次．I wind up my watch once a day．我每天上一次表．once or twice一两次．once in a while(or way)有时．once and again一再．❷ 一度，曾经，以前：The old poor peasant once gave us a good lesson in class struggle．这位老贫农曾经给我们上了一堂很好的阶级斗争课．This novel was once very popular．这本小说一度很受欢迎．once upon a time从前，古时．

－a．从前的：a once powerful country过去的强国．

－conj．一旦：Once you understand this rule，you will have no further difficulty．你一旦了解这条规则，就不会感到困难了．

－n．一次：Once is enough for me．我一次就够了．at once 1)立刻，马上：Come here at once!马上来!2)同时：Don’t all speak at once!不要都一齐说!(just)for once(=for this once)就这一次：He is right for once．这一次他对了．