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1、once 一次,曾经 whilom 曾经,以前,从前 ever 曾经,永远,究竟 have already 曾经 at one time 曾经 曾经到过 have been to 曾经沧海 have sailed the seven seas 几年前我曾经风过她一面。
2、 I met her once several years ago. 她曾经参加过校队。
3、 She once played for the school team。
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