piston play of train 列车活塞作用
shoulder play of piston ring 活塞环上下间隙
piston rod free play 活塞杆的自由串动
axial play of piston ring 活塞环轴向间隙
When all brakes drag, it may be that the brake pedal does not have sufficient play, so that the piston in the master cylinder does not fully retract.
如果所有的制动器都咬死，可能是由于踏板未能充分地起作用，致使制动总泵中的活塞不能完全退回。
However, in research of water hydraulic axial piston pump, inertia items should play an important role because the viscosity of water is much less than that of oil.
然而，在水压轴向柱塞泵的研究中，由于水的粘度比油的粘度小得多，因此，惯性项就起着较大的作用。
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