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1. Oxford American Dictionary

   once

   • IPA[wəns]

   美式

   • adv.
     on one occasion or for one time only；at all; on even one occasion (used for emphasis)
   • conj.
     as soon as; when
2. • 釋義
   • 片語

   adv.

   副詞

   • 1. on one occasion or for one time only they deliver once a week 同義詞 on one occasion, one time, one single time反義詞 twice, many times
   • ▪ at all; on even one occasion (used for emphasis) he never once complained if she once got an idea in her head you'd never move it 同義詞 ever, at any time, on any occasion, at all, under any circumstances, ... 更多on any account, in a million years
   • 2. at some time in the past; formerly He had once been an Army officer 同義詞 formerly, previously, in the past, at one time, at one point, ... 更多once upon a time, on a former occasion, on one occasion, one time, in one case, time was when, in days/times gone by, back in the day, in times past, in the (good) old days, long ago, archaicsometime, erst, erstwhile, whilom, literaryin days/times of yore, of yore反義詞 now

   conj.

   連接詞

   • 1. as soon as; when once the grapes were pressed, the juice was put into barrels

   片語

   • all at once
   • at once
   • for once
   • once a —, always a —
   • once more
   • once and for all
   • once and future
   • once in a while
   • once or twice
   • once upon a time
   • the once