Within a few weeks, all the equipment was found to be covered in thick layers of brake dust and needed to be put into protective casing.
过了几个星期后，发现所有设备都被闸盖上薄薄的一层灰土覆盖了，必须要铺上保护罩。
2
Too much dust will accumulate a certain bacteria, corrosion equipment.
过多的粉尘还会积累一定的病菌，腐蚀设备。
3
The dust is necessary in advance. The advance is a dust removal equipment is added in environmental protection equipment imported before, also known as the dust before.