dirtn.污垢；泥土；灰尘dirt trapn.挡渣器dirttrackn.泥铺跑道dirt test染质试验:检乳dirt spot污斑dirt pits尘点dirt band污层,冰川碎石带dirt-bedn.泥土层dirt scoop挖土铲斗, 铲运机dirt cheapadj.极便宜的dirt wagon垃圾车