例句
I water this little cactus once every two weeks.
我每两周给这株小仙人掌浇一次水。
Once reliable public transport becomes available, more commuters may choose to leave their cars at home.
一旦有了可靠的公共交通，更多通勤者可能会选择不开车出门。
常用搭配
- once a week｜每周一次
- at once｜立刻
- once again｜再一次
- once in a while｜偶尔
用法提示
once引导将来时间从句时，通常用一般现在时。