once是什么意思?

once是什么意思?

是英文，常指“一旦，曾经”。1、一次I've only been there once.我只去过那里一次。He cleans his car once a week.他每周洗一次汽车。She only sees her parents once every six months.她每半年才探望一次父母。2 、曾；曾经I once met your mother.我曾经见过你母亲。He once lived in Zambia.他曾在赞比亚生活过。This book was famous once, but nobody reads it today.这本书曾名噪一时，但现在却无人问津。3、（用于否定句、疑问句和if后）曾，根本He never once offered to help.他从没有主动提出过帮忙。If she once decides to do something, you won't change her mind.她一旦决定干什么，谁也改变不了她的主意。