人们心目中传统的机器人形象是锵锵作响的金属，但有些业内人士开始反问为什么（机器人一定）应该是那样。
Traditionally, people have thought of robots as whirring bits of metal, but there are those in the field who ask why that need be so.
在一些工业地区，马匹正沿着金属轨道拉着满载货物、带法兰轮子的马车；固定的蒸汽机在工厂和矿井里噗噗作响。
In some industrial regions, heavily laden wagons, with flanged wheels, were being hauled by horses along metal rails; and the stationary steam engine was puffing in the factory and mine.
杰克的衣服都被烤焦了，耳朵里嗡嗡作响，他跌跌撞撞地站起来往前冲出，直到后背重重撞上配电房的金属门——那扇门被爆炸的气浪熏灸后还是热的。
Clothing scorched, ears ringing, Jack stumbled to his feet and lunged forward. He slammed his back against the power shed's metal door - still hot from the blast.
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