once
US /wʌns/
UK /wʌns/
1.
一次
on one occasion or for one time only
:
•
I only met him once.
我只見過他一次。
•
You only live once.
你只活一次。
2.
曾經, 從前
in the past; formerly
:
•
He was once a famous actor.
他曾經是一位著名的演員。
•
Once upon a time, there was a princess.
從前，有一位公主。
1.
一旦, 只要
as soon as; when
:
•
Once you finish your homework, you can play.
你一旦完成作業，就可以玩了。
•
Once he arrived, the meeting began.
他一到，會議就開始了。