up & down stroke 弹片上下动作
up-down stroke of oil pump 油泵的上
Up-down Stroke Velocity 上下冲程速度
Down Up Stroke 挥动打击法
Up for the down stroke 击倒后起来 ; 唱片名
The movement velocity of sucker rods when fluid of polymer in wellbore changed with time changing during up-down stroke. Then fluid of polymer belonged to unsteady flow of viscoelasticity fluid doing periodical in-and-fro motion in eccentric annulus.
聚合物在井筒内的流动过程中,抽油杆的运动速度在上下冲程内随时间变化,因此此时聚合物的流动属于粘弹性流体在内管做往复运动的偏心环空非定常流。
参考来源 - 粘弹性流体偏心环空非定常流的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The piston travels down on the intake stroke, up on the compression stroke, down on the power stroke and up on the exhaust stroke.
进气行程，活塞下行；压缩行程，活塞上行；做功行程，活塞下行；排气行程，活塞上行。
Both the down stroke and the up stroke are highlighted in different colors.
无论是向上和向下中风中风是突出了不同的颜色。
With the down stroke of a wing during flight, the body moves up, but the subsequent upstroke can counter that force.
用飞行翼的上下行程，身体向上移动，但随后的冲程可以对抗这种力量。
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