In other words, sprinters sacrifice the mechanical advantage of a long lever for the benefit of a stronger push-off.
换句话说，短跑选手牺牲了长杠杆所带来的力学优势从而获得了更为迅猛的起跑速度。
The longer those handles are, the easier it is going to be to lift up the load. If you had really short handles, you would have poor mechanical advantage.
操纵杆越长就越容易抬起重荷，而如果你的操纵杆真的过短，那你将在力学上处于劣势。
This has the advantage of eliminating two wasteful steps: the conversion of the mechanical power of a windmill into electricity and its subsequent reconversion into mechanical power in a compressor.
这可消除两处能耗，即在风力的机械能转化为电能时，以及随后压缩机中的电能转化为机械能时。
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