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The best machines and to be chosen above all others are those which consist of the fewest parts or which are the simplest, which produce the least friction; which are not too heavily loaded, and where the power can be conveniently applied without any waste.
最好的机器是由最少的零件组成的，或者是最简单的、产生最少摩擦的机器;负荷不太重，而且电源使用方便，不会造成任何浪费。