It is common knowledge that iron has little use in its pure state.

大家都知道纯态的铁几乎没有用处。

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The material first used was copper for it is easily obtained in its pure state.

最先使用的材料是铜，因为纯属易于炼取。

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We take care of things here, so that the entire world can hear and see nature in its pure state.

有我们悉心呵护这里的一切，全世界才得以欣赏饱览此地纯朴的自然之美。

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Hydrogen molecules in their pure state repel one another much the way unmatched magnets do.

FORBES: Companies, People, Ideas

But it's been altered so many times and so destructively that it's not as though we're restoring a pure state of nature.

WSJ: A Renegade Architect Connects Cities and the Natural World

One way to start would be to use fewer alloys if possible, as that will help return metals to a more pure state and make them easier to recycle.

FORBES: INTERVIEW: Recycling Of Specialty Metals Needs Improvement - Yale Researcher