1·Iron oxide, after all, is not toxic.
毕竟氧化铁是无毒的。
2·The scientists then added powdered magnetite, an iron oxide present on Mars, to the flasks.
科学家接着又往烧瓶内加入粉末状磁铁矿和火星上现有的一种氧化铁。
3·Hematite is an iron oxide that is deep red in color.
赤铁矿是一种具有深红颜色的氧化铁。
4·Corrosion is an electro-chemical process by which a metal such as mild steel ,returns to its natural state ,state ,such as iron oxide or rust.
上面的译文便犯了定义过宽的错误。 试译：腐蚀是金属（如低碳钢）返回其天然状态（如氧化铁即铁锈）的电化学过程。
5·The new method involves passing a current through a molten pool of iron oxide, which drives off the originally sought-after oxygen.
新方法的步骤则包括向熔炉里的氧化铁通电，从而释放原本就炙手可热的氧气。