Scratches can prevent the free movement of the piston in the sleeve.
A能防止自由运动的活塞在套筒中有划痕。
B刻痕能阻止活塞在套筒中的自由运动。
C刻痕能防止自由运动的活塞在套筒中。
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Scratches can prevent the free movement of the piston in the sleeve.
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