Prestressed
预应力的（混凝土）
🗣️ 情景例句
Havefun!
开心点。
I know the boy whose father is an engineer.
我知道那个男孩的父亲是工程师。
Here was a seven-year-old girl who at the age of 19 months had become deaf and blind.
一个7岁的女孩，出生19个月后就得了聋盲症。