Deficiency of red corpuscles is caused by a lack of iron.

红血球数量不足是铁元素缺乏造成的。

《柯林斯英汉双解大词典》

In the diet, it is generally true that the darker the fruit the higher its iron content.

在饮食中，水果颜色越深，其铁含量就越高，这通常是正确的。

《柯林斯英汉双解大词典》

Steel is made from iron.

钢是由铁炼成的。

《牛津词典》

You could run the reaction, take solid iron gaseous oxygen, form iron oxide, measure the heat of formation of it, tabulate it.

你可以进行一个反应,用固态铁和氧气生成氧化铁，测量它的生成热，列成表格。

麻省理工公开课 - 热力学与动力学课程节选

Mercury is a liquid metal, and mercury, the planet, is the fastest moving naked eye heavenly body. Mars, iron, why is Mars red?

水银是液态金属，水银，行星，是肉眼能看到的运动最快的天体,火星，铁，为什么火星是红色的？

麻省理工公开课 - 固态化学导论课程节选

So iron left to own devices in the atmosphere in the presence of a little bit of water, with the water form iron oxide.

铁在大气中，在存在,少量水的条件下，大气会开始与水结合产生氧化铁。

麻省理工公开课 - 热力学与动力学课程节选