The power machine is run by a foot treadle and USES a knee lift to raise and lower the presser foot.

工业缝纫机是通过压脚启动的，用膝盖运动抬起压脚或降落压脚。

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Instead, efficient endurance running requires just a slight knee lift, a quick leg turnover, and a short stride.

相反，有效的长距离跑步只需要稍微的抬腿、很快的步频和短步幅。

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Lift your knee higher than you usually do when you are running.

当你跑步时，把你的膝盖抬得比平时高一些。

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But if you do have to lift, "do more of a knee squat, your back arched as if looking to the sky, " Goitz advises.

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