dusty materials

例句：

1. 1. The old books are covered in dusty materials.
   这些旧书都覆盖着灰尘。
2. 2.The room was filled with dusty materials that needed to be cleaned up.
   房间里充满了需要清理的灰尘。
3. 3. The construction site had accumulated a lot of dusty materials from the work being done.
   施工现场积累了很多灰尘，这是施工过程中产生的。