The fumes produced by welding metal often contain small amounts of manganese .

在焊接金属时所产生的烟雾中，常常包含了少量的锰。

But chemistry goes far beyond noxious fumes .

但化学的范畴远远超出有毒气体。

Releasing sulfurous fumes into the air or dumping radioactive water into the ocean is ostensibly the easiest and cheapest way to deal with unwanted byproducts .

向空中排放含硫磺废气或者向海洋里倾泻含辐射废水表面上是处理不需要的副产品最容易和最便宜的方法。

No one knows whether regular commuters breathing heavy traffic fumes suffer any lasting brain effect .

没人知道经常吸入大量汽车尾气的上班族大脑是否会受到持续的影响。

Fumes from automobiles and factory chimneys are toxic .

汽车和工厂烟囱所排出的烟是有毒的。