once

once
adverb
  1. on one occasion or for one time only
    一次
    they deliver once a week.
    他们一星期送一次货。
    [as noun the once]he'd only met her the once.
    他只见过她一次。
    ■[usu. with negative or if]at all; on even one occasion (used for emphasis)
    丝毫，一点；一次也（用于强调）
    he never once complained.
    他一次也没抱怨过。
    if she once got an idea in her head you'd never move it.
    她只要一有想法，你就休想让她改变主意。
  2. at some time in the past; formerly
    曾经；从前
    Gran had once been a famous singer.
    奶奶曾是个著名歌唱家。
  3. multiplied by one
    乘以一
    once two is two.
    二乘以一得二。
conjunction
  1. as soon as; when
    一旦；一…就
    once the grapes were pressed, the juice was put into barrels.
    葡萄一被挤压，葡萄汁就被装进桶里。
常用词组
all at once
  1. without warning; suddenly
    突然
    all at once the noise stopped.
    突然，吵闹声停止了。
  2. all at the same time
    同时
    a lot of beans are ready all at once.
    同时很多豆子准备好了。
at once
  1. immediately
    立刻；马上
    I fell asleep at once.
    我马上就睡着了。
  2. simultaneously
    同时
    computers that can do many things at once.
    可以同时做很多事的电脑。
for once (或this once)
  1. on this occasion only, as an exception
    就（这）一次；破例一回
    I hope you'll forgive me this once.
    我希望你就原谅我这一次。
once a ——, always a ——
  1. (proverb)a person cannot change their fundamental nature
    (谚)一次…始终…
    once a whinger, always a whinger.
    曾经是把短刀，始终是把短刀。
once again (或more)
  1. one more time
    又一次，再一次
once and for all (或once for all)
  1. now and for the last time; finally
    一劳永逸；彻底地
once and future
  1. denoting someone or something that is eternal, enduring, or constant
    永久的；持久的；持续的
    side two contains four once and future hit singles.
    第二面有四首持续走红的单曲。
once bitten, twice shy
  1. 见bite
once (或every once) in a while
  1. from time to time; occasionally
    偶然；间或
once or twice
  1. a few times
    一两次
once upon a time
  1. at some time in the past (used as a conventional opening of a story)
    从前（用于故事的开头）
    ■formerly
    曾经
    once upon a time she would have been jealous, but no longer.
    她曾经嫉妒心很强，不过现在不了。
语源
  1. Middle English ones, genitive of one. The spelling change in the 16th cent. was in order to retain the unvoiced sound of the final consonant
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