once

CET-4 Oxf 3000 初中 FREQ #288 ★★★★★

adv. 一次, 曾经, 一旦 conj. 一旦, 一经 n. 一次 a. 从前的

发音

/wʌn(t)s/
UK /wʌn(t)s/
UK /wɒn(t)s/
US /wʌn(t)s/

词形变化

onces 复数 onces

别名

vonce wonce wunst

教材释义与例句

名词

一次，一回

from the time when something happens

副词

一次；曾经

on one occasion only

连词

一旦

from the time when something happens

释义与例句

n.
  1. 1.

    Obsolete form of ounce.

    废旧
adv. A1 Oxf 3000
  1. 1.

    One and only one time.

    一次

    一遍

    I have only once eaten pizza.

  2. 2.

    Formerly; during some period in the past.

    曾经

    以前

    有一次

    He was once the most handsome man around.

    I once had a motorbicycle.

    Once I didn't drive a big car, but now I own an all-terrain 4WD.

    Wang notes that flowers have rooted and grow in the area once covered with ice.

  3. 3.

    At any time; ever.

    废旧

    If the facts once became known, we'd be in trouble.

    1934, Ernest Bramah, The Bravo of London Once bring in the police and what is inevitably bound to follow? There will be calls and interrogations and cross-questionings […]

  4. 4.

    One day, someday.

    废旧
  5. 5.

    Multiplied by one: indicating that a number is multiplied by one.

    数学

    Once three is three.

conj. B1 Oxf 3000
  1. 1.

    As soon as; when; after.

    一旦

    Near-synonym: immediately

    We'll get a move on once we find the damn car keys!

    Once you have obtained the elven bow, return to the troll bridge and trade it for the sleeping potion.

    Once he is married, he will be able to claim the inheritance.

词汇关系

副词

同义词 4

formerly erstwhile erst one time

相关短语

once-over n. 浏览一遍, 大略调查, 草草看一遍, 狠揍 once and for all 一次了结地, 一劳永逸地, 彻底地, 永远地, 最后一次 once in a while 偶尔 all at once 突然 for once 就这一次 once upon a time 从前 once removed 隔一代（或二代）[计算亲属关系时用] once or twice 一两次, 几次 once in a blue moon 千载难逢地 once bitten, twice shy 一朝被蛇咬，十年怕井绳 once again 再一次 once you go black, you never go back once more 再一次 once over once overs

词源

From Middle English ones, from Old English ānes, a remodelling (after ān (“one”)) of ǣnes, itself an extension of ǣne (“once”) with the genitive suffix -es. Equivalent to one + -s. Cognate with Saterland Frisian enst, insen (“once”), West Frisian iens (“once”), Dutch eens (“once”), German Low German eens, ins (“once”), German einst (“once”). More at one (including regarding the development of the pronunciation) and -s.

来源：wiktionary