这里to相当于比,句中也就理解为除,机器工作率除其总量就是工作效率.相当于工作总量除以单位时间工作量就是工作效率.to做此解再如：The ratio of men to women is two to one.男女比例为二比一
The ratio of the work done by the machine ( C )the work done
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