adv. 1.一次，一趟，一回，一遍；一倍。 I should like to see him once before I go. 在我走以前我想看他一次。 once a year 每年一次。 We die but once. 我们不过死一次罢了。 O- bit, twice shy. 一度被咬，再见胆小。 O- nought is nought. 零零得零。 2.从前，曾经。 O- I lived in London 我从前在伦敦住过。 I once saw him playing Hamlet. 我曾经看过他演哈姆雷特。 a once powerful nation 曾经强盛过的国家。 3.一旦…。 when once he understands 他一旦了解时。 4.一次也(不)，无论何时也(不)〔用于否定结构〕。 短语和例子 I have not seen him once. 我一次也没见过他。 every once in a while 〔美国〕偶尔。 if once ＝ when once 一旦… (If we once lose sight of him, we shall never set eyes on him again. 倘若我们一旦丢了他，就再也找不着他了)。 more than once 不只一次，好多次。 not once 一次也不…。 once again ＝once more. once and again 〔书面语〕一再，再三。 once and away ＝ once for all. once (and) for all [always] 一劳永逸，限此一次；断然，爽爽快快 (I shall explain it fully once for all. 我详细解说一次以后就不再解说了。Tell him so once for all. 干脆就此一次把话对他说了吧)。 once in a way [while] 有时，间或，偶尔。 once more 再一次，再来一次。 once or twice 一两次 (not once or twice 一再，再三，好几次)。 once over＝once more. once upon a time 从前。
一…(便)…，一经，一旦。 O- you begin you must continue. 一旦开始你就不可以中断了。 adj. 从前的。 my once master 我从前的主人。 n. 一次，一回。 O- is enough for me. 我一次就够了。 all at once 忽然，突然。 and ... at once 也；同时 (interesting and instructive at once 既有趣又有益)。 at once 立刻，马上；同时 (Come at once. 马上来。at once interesting and instructive 既有趣又有益)。 for that once 只那一次，就是那回。 for (this) once 这一次(特别要)，就这一回 (Do it for this once. 就干这一次吧)。
on one occasion; "once I ran into her" 同义词：one time, in one case, one time, in one case,
at a previous time; "at one time he loved her"; "her erstwhile writing"; "she was a dancer once"; 同义词：formerly, at one time, erstwhile, erst, formerly, at one time, erstwhile, erst,
as soon as; "once we are home, we can rest"
on one occasion; "once I ran into her" 同义词：one time, in one case, one time, in one case,
at a previous time; "at one time he loved her"; "her erstwhile writing"; "she was a dancer once"; 同义词：formerly, at one time, erstwhile, erst, formerly, at one time, erstwhile, erst,
as soon as; "once we are home, we can rest"
例句与用法
1.
Remember, you have once been deceived . 别忘记，你已经上过一次当了。
2.
I should like to see him once before i go . 在我走以前我想看他一次。
3.
The matter is urgent and must be dealt with at once . 必须立即处理。
4.
A strong objection at once occurred to us . 我们立刻遇到强烈的反对。
5.
We must evacuate those soldiers at once ! 我们必须立即撤出这些士兵！
6.
Once i nourished the entire human race . 过去，我曾经养育过整个人类。
7.
Once he took the vow his loyalty never wavered . 他的忠诚从不动摇。
8.
Once motion stops, hearing is impaired . 一旦动作停止，听觉就失灵。
9.
I have relaxed some standards i once had . 我是从以前的立场后退了。
10.
He realized at once what was happening . 他一眼就看清了当时的情况。
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