once

once a -, always a - a person cannot change their fundamental nature.

1993Margaret AtwoodThe Robber Bride She was once a Catholic…and once a Catholic, always a Catholic, according to her mother.

once and for all (or once for all) now and for the last time; finally.

once and future denoting someone or something that is eternal, enduring, or constant.

☞ This expression comes from T. H. White's The Once and Future King (1958), a series of novels about the Arthurian legends.

once bitten, twice shy a bad experience makes you wary of the same thing happening again.

☞ This expression dates from the late 19th century. A variant common in the USA is once burned, twice shy.

once in a blue moon: seeblue.

once (or every once) in a while from time to time; occasionally.

1989Annie DillardThe Writing Life Every once in a while Rahm saw a peephole in the clouds and buzzed over for a look.

once upon a time: seetime.

词组	once
释义	once once a -, always a - a person cannot change their fundamental nature. 1993Margaret AtwoodThe Robber Bride She was once a Catholic…and once a Catholic, always a Catholic, according to her mother. once and for all (or once for all) now and for the last time; finally. once and future denoting someone or something that is eternal, enduring, or constant. ☞ This expression comes from T. H. White's The Once and Future King (1958), a series of novels about the Arthurian legends. once bitten, twice shy a bad experience makes you wary of the same thing happening again. ☞ This expression dates from the late 19th century. A variant common in the USA is once burned, twice shy. once in a blue moon: seeblue. once (or every once) in a while from time to time; occasionally. 1989Annie DillardThe Writing Life Every once in a while Rahm saw a peephole in the clouds and buzzed over for a look. once upon a time: seetime.
随便看	beard the lion in his den beard the lion in his den beard the lion in his den beard the lion in his den (or lair) beard the lion in his lair bear fruit bear fruit bear in mind bear in mind be art and part of be art and part of bear the brunt of bear the brunt of be as good as your word be as good as your word be asking for it be asking for trouble be asking for trouble be asking for trouble (or be asking for it) be as nothing (compared) to be as nothing to beast beat beat about the bush beat about the bush