thick covering

例句：

1. 1. The roof needs a thick covering to protect it from the rain.
   屋顶需要厚覆盖层来保护它免受雨水的侵蚀。
2. 2. The car has a thick covering of dust on its windshield.
   汽车的前挡风玻璃上积满了灰尘。
3. 3.The new paint job added a thick covering to the old wall.
   新的油漆工作给旧墙增加了一层厚厚的覆盖层。