Definition: dust, soil or any substance that makes a surface not clean Level: B1
他的外套上沾满了灰尘。
His coat was covered with ___dirt.
这种新材料设计用于抵抗灰尘。
The new material is designed to resist ___dirt.
在外面玩耍后，孩子们手上沾了灰尘。
After playing outside, the children had ___dirt on their hands.
