Steel is composed of iron and a number of other elements.
钢是由铁和其它一些元素组成的。
Gold, iron and tin are elements.
金，铁和锡是化学元素。
Found trace elements of iron, chromium, manganese and carbon.
找到东西的成分是铁，铬，锰以及碳。
How were the heavy elements from iron to uranium made?
从铁到铀的重元素如何形成？
How were the heavy elements from iron to uranium made?
从铁到铀的重元素如何形成？
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