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》

Called IceCube, it will work by detecting the flashes of light generated on those rare occasions when a neutrino hits one of the atoms in a molecule of water in the ice.

这架望远镜被命名为“冰立方”，其工作原理是：当一个微中子撞击冰中的水分子原子时，望远镜就会探测这些罕见的场合中产生的闪光。

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However,each time a plant takes in one molecule of carbon dioxide gas, it loses hundreds of water molecules.

VOA: special.2010.01.26

And that's all that's big enough to pass through or small enough to pass through. And if we go up even just one row on the periodic table to potassium, what we actually see is now that it's going to be too large, and, in fact, a potassium solvated with one water molecule won't go through our channel.

就是这样刚好大到它通过,或者说刚好小到它通过,即使我们再沿着周期表往下走仅仅一行到钾离子，我们看到的就将是它的个头太大了，实际上，溶解于一个水分子的单个钾离子,不能穿过我们的通道。

麻省理工公开课 - 化学原理课程节选

If you filled the entire solar system with water, and mixed in one molecule of duck liver, it would be much more concentrated than this stuff.

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Soap is made of long molecules with ends that behave differently: One end of the molecule is attracted to water and the other is repelled by it.

BBC: Magnetic soap could help in oil spill clean-ups