The use of chemical fertilizers has turned the farmer into a cross between an industrial chemist and a mechanic.化学肥料的使用把农民变成了工业化学家和机械工。The young mechanic readily fixed the car.那年轻的机械工利索地修好了汽车。We'll send a mechanic out as soon as we can.我们会尽快派一名机械工过来。