But the Chinese farmers used six times more nitrogen, and produced almost twenty-three times more surplus nitrogen.

VOA: special.2009.07.28

If we take nitrogen, we've got N2, and we've got one, two, three, four, five.

比如说氮，我们得到了氮气，我们有一个，两个，三个，四个，五个。

麻省理工公开课 - 固态化学导论课程节选

Here is the second nitrogen, one, two, three, four, five.

这是第二个氮，一二三四五。

麻省理工公开课 - 固态化学导论课程节选

Three unpaired electrons in nitrogen.

有三个未成键电子在氮原子中。

麻省理工公开课 - 固态化学导论课程节选