Postorder
[计] 后根次序
🗣️ 情景例句
Stop being so moody.
不要这么喜怒无常。
I'm free tonight.
我今晚有空。
Did you serve this gentleman half an hour ago, Caroline? He says he's the man who bought these books.
卡罗琳，半小时前你接待过这位先生吗？他说他就是买这两本书的人。