Understructure
n. 基础, 下层结构
🗣️ 情景例句
What about you?
你呢？
I haven't seen you for a long time.
好久没有见到你了。
Punctuality is a necessary habit in all public affairs in civilized society.
准时是文明社会中进行一切社交活动时必须养成的习惯。