piston ring wall 活塞环壁
The dust will also cause bearing, cylinder-wall, and piston and ring wear.
灰尘同．样也会导致轴承、气缸壁、活塞和活塞环的磨损。
The main section of a piston is known as the skirts. It forms a bearing area in contact with the cylinder wall.
活塞的主要部分叫活塞裙部。其与气缸壁接触形成了支承面。
It is equipped with piston rings to provide a good seal between the cylinder wall and piston.
上面装有活塞环，从而使活塞和气缸壁之间具有良好的密封性。
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