The root causes of motorcycle cylinder block wearing are temperature variation and presence of hard abrasive dust.

摩托车发动机气缸磨损的根本原因在于温度的变化和硬质磨粒的存在。

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The wear bag and box. With strong abrasive dust in the condition, the wear amount can be thought and is proportional to the concentration of dust.

滤袋和箱体的磨损。在粉尘具有强磨蚀性的状况下，其磨损量能够以为与含尘浓度成正比。

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These powders were developed by doctors, dentists and chemists and included substances very abrasive to teeth, such as brick dust, crushed China, earthenware and cuttlefish.

医生、牙医和化学家们开发出的牙粉中含有研磨牙齿的物质，如砖灰、碎瓷器、陶器和乌贼。

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