我的自行车有一个轻质的铝制车架。

My bike has a lightweight aluminum ___frame.

钢结构很坚固，但这栋建筑的基本框架是木质的。

The steel structure is strong, but the building's basic ___frame is made of wood.

在添加垫子之前，我们先组装了沙发的木质框架。

Before adding the cushions, we first assembled the wooden ___frame of the sofa.