The ammonia oxidation test was made under the mixed atmosphere of NO2/O2. Ammonia oxidizer could use NO2 as electron acceptor to oxidize ammonia and produce NO when there was no molecule oxygen.

在NO2/O2混合气氛下进行氨氧化试验，结果表明，无分子氧时，氨氧化菌能以NO2为电子受体氧化氨，并产生NO；

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Two atoms of hydrogen combine with one atom of oxygen to form a molecule of water.

两个氢原子和一个氧原子结合组成一个水分子。

《牛津词典》

A molecule of water consists of two atoms of hydrogen and one atom of oxygen.

水分子由两个氢原子和一个氧原子构成。

《牛津词典》

So, if we compare the sulfur to the oxygen, the oxygen it turns out is more electronegative and that is what holds the negative charge in this molecule.

因此，如果我们来比一下硫和氧，氧应该有更高的电负性,而在这个分子中它确实有负的电荷。

麻省理工公开课 - 化学原理课程节选

Ozone is a version of oxygen with three atoms per molecule, whereas normal, everyday oxygen has only two.

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The dots that make up the figures in the movie are the oxygen atoms in the molecule, Heinrich said.

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That could cause the oxygen to become liberated from water molecule and turned into a gaseous form.

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