最小光杆负荷发生在下行冲程开始时的冲程顶部附近。
The minimum polished rod load occurs near the top of the stroke with the start of the downstroke.
光杆上行冲程时的最大负载与下行冲程时的最小负载之差。
The difference in the peak load on the upstroke and the minimum load on the downstroke of a polished rod.
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。
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。
With the down stroke of a wing during flight, the body moves up, but the subsequent upstroke can counter that force.
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