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。
A Bellows operated by an assistant or by a foot treadle provided the forced draft for raising the temperature of the fire. Later, a waterwheel or animal power was often used to operate the Bellows.
用手动或脚踏风箱供给强制气流，以提高火焰温度，后来用水轮机或兽力带动风箱。
The foot bar is that part which differs it from other scooters. Customers just need step on treadle to make it glide, no need drive the ground.
这个踏杆就是酷步车与其它滑板车不一样的地方，只需踩动踏杆就可以连续滑行，无需蹬踩地面。
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