A third is certain basic chemicals such as carbon, oxygen and nitrogen.

第三种是某些基本的化学物质，如碳、氧和氮。

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A century earlier, Henry Cavendish had noted the existence of a residual gas when oxygen and nitrogen are removed from air, but its importance had not been realized.

一个世纪前，亨利·卡文迪什注意到当空气中的氧气和氮气被除去，还有其他剩余气体存在，但人们还没有认识到它们的重要性。

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But improved farming methods later increased their yields and, at the same time, made better use of chemical nitrogen fertilizer.

VOA: special.2009.07.28

So in terms of the first step of skeletal structure, this is actually going to be easier because we don't have a central atom, we just have carbon and nitrogen here.

对于第一步画出骨架，其实比刚才更容易,因为我们没有一个中心原子，我们这里只有碳和氮两个原子。

麻省理工公开课 - 化学原理课程节选

For example, we can talk about nitrogen, and nitrogen has five valence electrons shown here.

例如，我们可以讨论氮原子，氮原子有5个价电子。

麻省理工公开课 - 化学原理课程节选

The surfactant itself also burns without creating emissions beyond water, carbon dioxide and nitrogen.

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Potash is the biggest producer of potash and nitrogen and third-biggest maker of phosphate.

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According to the company it removes not just sulfur dioxide, but also carbon dioxide and nitrogen oxides.

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