是once:
adv. 一次曾經
conj. 一旦
n. 一次,一回
I have visited grandma once this week.
我這周去看過奶奶一次。
I met Miquela once, briefly.
我見過蜜凱拉一次,時間很短。
Just for once he arrived on time.
只有這一次他按時到了。
The water is fine once you're in!
你一旦下了水,就會覺得水裏挺舒適。
I've only been there once.
我只去過那裏一次。