Postorder
[计] 后根次序
🗣️ 情景例句
I heard a lot of shouting, what's up?
我听见很多喊声，出了什么事了？
A little learning is a dangerous thing.
浅学误人。
I got a bad headache, and my nose is running.
我头痛得厉害，还流鼻涕。