Word · CEFR A1 · Frequency #548
once
/wʌn(t)s/
adverb
一次
核心释义
One time; on one occasion.
- 1.
仅一次
One and only one time.
- 2.
一次
on one occasion
- 3.
曾经；过去某段时期
Formerly; during some period in the past.
- 4.
一旦
as soon as
- 5.
乘以一:表示一个数乘以一
Multiplied by one: indicating that a number is multiplied by one.
- 6.
曾经
at a previous time
曾经；以前；一旦；乘以一；仅一次；曾经；过去某段时期
用法In use
I visit my grandparents once a month.
用法提示：这里的“once”表示频率，意为“一次”。
Once you finish your homework, you can play outside.
用法提示：这里的“once”表示条件，意为“一旦”。
She has only been to Paris once.
用法提示：这里的“once”表示次数，意为“一次”。
once I ran into her
once we are home, we can rest
she was a dancer once
once + past simple
表示过去某个不确定的时间。
相关词与表达Connections
搭配Collocations
- once upon a time
- 从前
- Once upon a time, there was a princess in a castle.从前，城堡里住着一位公主。
- at once
- 立即，马上
- Please come here at once.请马上过来。
- once in a while
- 偶尔，间或
- I go to the cinema once in a while.我偶尔去看电影。
- once again
- 再次
- Let me explain it once again.让我再解释一遍。
- for once
- 就这一次
- For once, he arrived on time.
学习提示Learner notes
记忆技巧Memory Tip
联想 'on one occasion' 来记住 'once' 意为一次
语境与语域Context & Register
中性；通常用于日常对话和记叙文，表示‘一次’。
发音与拼写Pronunciation & Spelling
No common words rhyme with 'once'. The words listed share the '-nce' spelling but have different vowel sounds.
高价值词汇High-value vocabulary
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
用法优先级Usage priority
Collins 词频等级为 5，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.