staircase component

例句：

1. 1.The architect designed a new staircase component for the building.
   建筑师为大楼设计了一个新的楼梯组件。
2. 2. The engineer tested the staircase component before installation.
   工程师在安装前测试了楼梯组件。
3. 3.The construction team assembled the staircase components in the morning.
   建筑队在早上组装了楼梯组件。