once
US /wʌns/
UK /wʌns/
副词
1.
一次
on one occasion or for one time only
示例:
•
I only met him once.
我只见过他一次。
•
You only live once.
你只活一次。
2.
曾经, 从前
in the past; formerly
示例:
•
He was once a famous actor.
他曾经是一位著名的演员。
•
Once upon a time, there was a princess.
从前，有一位公主。
连词
一旦, 只要
as soon as; when
示例:
•
Once you finish your homework, you can play.
你一旦完成作业，就可以玩了。
•
Once he arrived, the meeting began.
他一到，会议就开始了。
同义词: