Solar furnaces help obtain clean materials without any contaminants .
太阳炉能帮人获得没有污染物的洁净材料。
Bombs in the furnaces would make quite a bang .
鼓风炉里放炸弹可以引起大爆炸。
Kumagaya , japan - with its towering furnaces and clanging conveyer belts carrying crushed rock , taiheiyo cement 's factory looks like an industrial revolution relic .