The slightest motion of a patient in bed creates friction between skin and sheets and results in loss of cells from the skin's outermost layer.

卧床病人最轻微的活动就会在皮肤和床单之间产生摩擦力，结果就会引起皮肤最外层脱落。

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It is found that the motion modes strongly depend on the bed thickness and vibration acceleration.

发现运动模式与颗粒床厚度及振动加速度有很强的依赖关系。

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It is found that the motion modes of particles strongly depend on the bed thickness.

在改变颗粒床厚度时，我们发现，颗粒床的运动模式与其高度有着密切的关系。

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The day after a knee replacement, most orthopedic surgeons have their patients use a continuous passive-motion machine, which flexes and extends the knee as they lie in bed.

NEWYORKER: Big Med