名词檩条; 檩桁条; 梁
1. 桁条;梁：pure shear 纯剪力 | purlin 桁条;梁 | purpose-built restaurant 专作酒楼用途的楼宇
2. 檩：purity 纯度 | purlin 檩 | purple-k-powder 碳酸氢钾干粉灭火剂