As the plunger is depressed to inject the fluid the plunger moves axially in the barrel while the piston is stationary.
当柱塞被压下以注射液体时，柱塞在针筒内作轴向运动，而活塞则是固定的。
As the plunger is depressed to inject the fluid the plunger moves axially in the barrel while the piston is stationary.
当柱塞被压下以注射液体时，柱塞在针筒内作轴向运动，而活塞则是固定的。
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