Understructure
n. 基础, 下层结构
🗣️ 情景例句
You do. You do. There's a book here.
当然 ，当然。书要出版。
You're so retarded!
你很迟钝呐！
I have just heard from my sister, Mary.
我刚收到我妹妹玛丽的一封信。