basic roof

例句：

1. 1. The basic roof of the house is made of wood.
   这所房子的基本屋顶是用木头做的。
2. 2. The basic roof of the building is designed to withstand heavy rains.
   这座建筑的基本屋顶设计来承受大雨。
3. 3.The basic roof of the tent is waterproofed to prevent leaks.
   帐篷的基本屋顶被防水处理以防止漏水。