once
英 /wʌns/ 美 /wʌns/
- adv. 一次on one occasion only
- adv. 曾经；从前at a time in the past
- conj. 一旦；当……之后as soon as something happens or becomes true
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。
搭配
once a week 每周一次at once 立刻once again 再一次once in a while 偶尔
辨析提示
once引导将来时间从句时，通常用一般现在时。
相关词
插画、释义与录音：Word Atlas contributors（词光），CC BY 4.0，已修改。署名与许可