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使用推针，从钻孔上取出止推环。
Drilled knock-out holes for driving out thrust rings, using pins.
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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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分段止推环吸收了所有由内部压力产生的推力。
Segmental thrust ring absorbs all the thrusts applied by internal pressure.
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