Underpinning
n. 基础材料, 支承结构
✅ 同义词
🗣️ 情景例句
To ask if there is some mistake.
想问问是否搞错了。
The houses downtown are very expensive.
市区的房子很贵。
Do you often have sports at school?
你在学校经常参加体育活动吗？