once
1
一次, 仅一次
for one single time
- I only ate sushi once in Japan.
我在日本只吃过一次寿司。
- The bus comes once an hour.
公交车每小时来一次。
- She called me once but never again.
她一次打给我，但再也没有打过。
- We meet once a year for reunion.
我们每年一次聚会。
- He slipped once on the ice but caught himself.
他在冰上滑了一次，但稳住了自己。
同义词：
2
曾经, 一度
at a time in the past
- I once visited that museum when I was a child.
曾经我小时候参观过那个博物馆。
- She once lived in New York before moving here.
她曾经住在纽约，然后搬到了这里。
- He once worked as a teacher but switched careers later.
曾经他当过老师，但后来换了职业。
- We once went on a trip to Italy together.
有一次我们一起去意大利旅行。
- They once had a dog, but it passed away last year.
曾经他们有一只狗，但去年去世了。
3
一次, 曾经
used to indicate one generation of separation in family trees
- My once-removed cousin is my dad's first cousin.
我一次移除的表亲是我父亲的第一个表亲。
- She's my aunt once removed, my grandmother's sister.
她是我的表姑妈，我祖母的妹妹。
- We're first cousins once removed.
我们是一度被移除的表兄弟。
- His once-removed uncle inherited the estate.
他一度被移除的叔叔继承了房产。
- Are we cousins or once removed?
我们是表亲还是一代远亲？