The bearings have a layer of seal coating, can stop the 95 per cent of mineral dust particles, which extend the machine wear life.

该轴承有一层密封涂层，可以阻挡95%的矿业尘埃粒子，以此来延长机器磨损寿命。

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These atmospheric particles or aerosols maybe natural formed or caused by the human actions. They consist of dust, soot, organic molecules, as well as sea salt crystals which are mineral-rich.

这些大气粒子或浮质可能是自然形成的，也可能是人为产生的，它们包括富含矿物质的尘埃、煤烟、有机分子以及海盐晶体。

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The enormous shroud of fine mineral dust particles now stretches from the Arctic Circle in the north to the French Mediterranean coast in the south, and from Spain into Russia.

BBC: EU emergency talks called on volcanic ash air chaos