通过螺杆和杠杆机构由人工施加推力，或用风压或液压施加推力。
The pushing force may be supplied manually and multiplied by a screw and lever arrangement, or pneumatic or hydraulic pressure may be used.
为了合理利用能源，文中引入相对推进效率作为是否施加推力的门限。
Considering the energy consumption, the relative thrust efficiency is introduced as a threshold deciding whether to thrust or coast.
弧形止推环吸收内部压力施加的全部推力。
Segmental thrust ring absorbs all the thrust applied by internal pressure.
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