hinged arm

例句：

1. 1. The hinged arm on the door is broken.
   门上的铰接臂坏了。
2. 2. The hinged arm of the table is loose.
   桌子的铰接臂松动了。
3. 3. The hinged arm of the chair is too heavy to lift.
   椅子的铰接臂太重，搬不动。