If the thighbone doesn't rotate enough, you'll apply huge pinching pressure to the meniscus—as if your shinbone and thighbone were a giant pair of pliers.
如果大腿骨旋转不够充分，你会把巨大的拧压施加到到半月板上——胫骨和大腿骨就好像一把巨大的钳子。
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As they do so, each pair applies pressure to a soft ring around the driveshaft. The pulsating muscles collectively and continuously pinch the shaft and apply a rotational force, causing it to turn.