曾经: once以前: before; formerly; prior to; ...以前，曾经: at one time过去一度，以前曾经: at one time更喜欢你以前曾经尝试: try once more like you did before我以前曾经见到过他: i have seen him before曾经: 副词(表示有过某些行为或情况) once 他曾经在上海住过。 he once lived in shanghai. 她曾经参加过石油大会战。 she has taken part in a major battle for oil. 我以前曾经见到过他。 i have seen him before 梦见那些以前曾经来过的人们: dream of the ones who came before让我更喜欢听你唱你以前曾经: let me hear you sing once more like you did before以前: before; formerly; prior to; previously 以前各版 all the preceding editions; 很久以前 a long time ago; 以前我没来过这里 。i haven't been here before. 这事发生在他到达以前。 it happened prior to his arrival以前，很早以前: once upon a time你曾经: have you ever同时, 曾经: at one time同时，曾经: at one time曾；曾经: ever曾经,一度: at one time; atonetime曾经；一次: once曾经的: lcgwmsky比以前: than before从前, 以前: formerly如以前: as before以前的: erstwhile; fore; former; old; onetime; other; prev previous; prevenient; quondam; sometime; whilom以前留……: ever…before在以前: previously（曾经） 去过 某地: have / has been to s.p
