在西半球，显著的成就如下：发现和处理天然金属。
In the western hemisphere it was signalized by the discovery and treatment of the native metals.
天然金属，不容易生锈，常用于油漆中的色料，金属涂层，塑料生产过程中的稳定剂，染料及电池内的电溶液．。
It is a naturally occurring and abundant metal that does not easily corrode (rust). It is often used for pigments metal coatings, plastics(as a heat stabilizer), photographic films and batteries.
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.
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