灰尘, 尘土
fine, dry powder consisting of tiny particles of earth or waste matter lying on surfaces or carried in the air
:
• The old books were covered in a thick layer of dust.
旧书上覆盖着一层厚厚的灰尘。
• A cloud of dust rose as the car drove away.
汽车开走时,扬起了一阵灰尘。