Postorder
[计] 后根次序
🗣️ 情景例句
What can I do?
那我能做点什么呢？
It's the kind of work I've always wanted to do.
它是我常常想做的工作。
I don't want to know what it's been; I want to know what it is now.
我不想知道它曾经是什么；我想知道它现在是什么。