mitreblock

例句：

1. 1. The builders were installing mitre blocks on the roof.
   建筑工人正在给屋顶安装金属板。
2. 2.The engineers decided to install a mitre block at the corner of the building.
   工程师们决定在大楼一角安装一个金属板。
3. 3.The construction workers had to remove the old mitre blocks before installing the new ones.
   建筑工人在安装新金属板之前，必须先拆除旧的金属板。