dusty material

例句：

1. 1. This old rug is made of a very dusty material.
   这块旧地毯是用非常脏的材料做的。
2. 2. The car was covered in dusty material from the roadside.
   汽车被路边的尘土覆盖了。
3. 3.The old books were filled with dusty material that had been left behind by previous owners.
   这些旧书里充满了前主人留下的灰尘。