Op. cit.
abbr. 前面引用的书(in the work already quoted)
🗣️ 情景例句
your reasons for wanting an animal.
你要养动物的原因。
La, la, I wash them, and then I dry them.
啦啦，洗濯之后就把它们晒干。
and he had seen there evidence enough to overthrow Aristotle and Ptolemy together.
观察到的论据足以把亚里士多德和托勒密一起推翻。