Op. cit.
abbr. 前面引用的书(in the work already quoted)
🗣️ 情景例句
I don't see what you are getting at.
我不明白你究竟是什么意思。
He may well be contented who need neither borrow nor flatter.
一个既不用借债又不用奉承人的人，可以称得上心满意足。
Good afternoon!
下午好！