roof是什么意思,roof

the roofof a building is the covering on top of i tthat
rain-on-the-roof 什么意思
tig roof (参数屋顶)
湘少版五年级英语下册unit1 draw a cat on the roof
太阳能系统接地earthing标准以及屋顶隔离器roofisolator的选择标准