灰尘 dust; dirt; ash; spindrift 掸掉桌上的灰尘 dust the table; 灰尘飞扬。 the dust is rising in clouds. 你上衣上到处都是灰尘。 your coat is covered with dust
一层 a layer or deck; one story or floor (of a multi-story building); a stratum; a bed 薄薄的一层泥土 a thin layer of clay; 街道上的一层冰 a layer of ice on the street; 大楼中低于路面的一层 the basement storey [story]; 排成一层一层的蜂房 beehives arranged in storeys