| 单词 | once |
| 例句 | once adverb 1.•I spoke to him only once:on one occasion, one time, one single time. ANT twice, many times, often. 2.•he did not once help:ever, at any time, on any occasion, at all, under any circumstances, on any account. 3.•they were friends once:formerly, previously, in the past, at one time, at one point, once upon a time, time was when, in days/times gone by, in times past, in the (good) old days, long ago | archaic sometime, erstwhile, whilom | literary in days/times of yore, of yore. ANT now, currently.▶conjunction •he'll be all right once she's gone:as soon as, when, after, the instant, the second, the minute, the moment. PHRASES at once 1.•you must leave at once:immediately, right away, right now, this instant, this second, this minute, this moment, now, straightaway, instantly, directly, forthwith, promptly, without delay, without hesitation, without further ado | quickly, as fast as possible, as soon as possible, speedily | informal like a shot, in a flash, pronto, ASAP, in two shakes (of a lamb's tail). 2.•all the guests arrived at once:at the same time, at one and the same time, (all) together, simultaneously | as a group, in unison, in concert, in chorus. once and for all •I've made up my mind, once and for all:conclusively, decisively, finally, positively, definitely, definitively, absolutely, irrevocably | for good, for always, forever, permanently | informal for keeps. once in a while •we go hiking once in a while:occasionally, from time to time, (every) now and then/again, every so often, on occasion, at times, sometimes, off and on, at intervals, periodically, sporadically, intermittently. |
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