题目

英语翻译
Spur Gears
Gears,defined as toothed members transmitting rotary motion from one shaft to another,are among the oldest devices and inventions of man,In about 2600 B,C.the Chinese are known to have used a chariot incorporating a complex series of gears.Aristotle,in the fourth century B ,C,wrote of gears as if they were commonplace.In the fifteenth century A ,D,Leonardo da Vinci designed a multitude of devices incorporating many kinds of gears.
Among the various means of mechanical power transmission (including primarily gears,belts,and chains),gears are generally the most rugged and durable.Their power transmission efficiency is as high as 98 percent.On the other hand,gears are usually more costly than chains and belts.As would be expected,gear manufacturing costs increase sharply with increased precision---as required for the combination of high speeds and heavy loads,and for low noise levels.(Standard tolerances for various degrees of manufacturing precision have been

提问时间：2020-08-07

答案

小KASS：齿轮齿轮的齿形的成员,定义为从一个轴旋转传送到另一个设备时,最古老的发明,男,大约2600乙、丙.中国是一个已知的战车组成的复合系列齿轮.亚里士多德,在公元四世纪乙、丙、写的齿轮好像他们是司空见惯的事.在...