Pack the dirt firmly round the plants.
将植物周围的土培实。
Rain caused the loose dirt to pack.
雨使松土变成泥块。
Air conditioning in the use of a period of time, screen pack, evaporator and air supply systems will build up large dust, dirt, producing a large amount of bacteria, virus.
空调在使用一段时间后，过滤网、蒸发器和送风系统上会积聚大量灰尘、污垢，产生大量的细菌、病毒。
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