The crankshaft serves to change the reciprocating power into rotarypower.
曲轴的作用是把往返力变为旋转动力。
2
A rotary engine attached to the steam engine enabled shafts to be turned and machines to be driven, resulting in mills using steam power to spin and weave cotton.
连接在蒸汽机上的旋转式发动机使轴承转动，机器得以驱动，从而使得利用蒸汽动力纺线和织布的工厂出现。
3
The crankshaft, regarded as the "backbone" of the engine, serves to change the reciprocating motion of the piston into rotary motion and handles the entire power output.