built up of

• v. 由 ... 建成(由 ... 组成)

例句

用作动词 (v.)

1. These buildings are made of concrete and steel.
   这些房屋是用钢筋混凝土建成的。
2. It looked splendid when first built.
   刚建成的时候，它看起来真是金碧辉煌。