催化剂可以分为两种：过渡金属双官能催化剂和过渡金属的碳氧化物催化剂。
The catalysts can divide into two kinds: the transition metal bifunctional catalysts and oxycarbide catalysts of transition metals.
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。
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.
如果把一根导电金属丝放在金属铅和二氧化铅之间，铅释放的电子会经金属丝传递到二氧化铅，这个过程会产生电流。
If a conductive wire is run between the two, electrons released by the lead will run through it towards the lead dioxide, generating an electrical current as they do so.
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