Almost all the oxygen in water is oxygen 16, but a few molecules out of every thousand incorporate the heavier isotope 18.

水中几乎所有的氧都是氧16，但每一千个分子中就有几个含有较重的同位素18。

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Dissolved oxygen in water reflects degree of water polluted, it is one of the important indexes in water monitoring.

水中的溶解氧可反映水体受污染的程度，是水质监测的一项重要指标。

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These devices then combine hydrogen and oxygen to make water and liberate electricity in the process.

然后这些装置将氢和氧合成水，并在这个过程中释放电力。

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High levels of domoic acid in the sardines may have worsened the effects of oxygen loss in the water as the fish crowded into a limited space.

VOA: special.2011.03.15

If we take hydrogen peroxide in the liquid state, it can break down to form water and oxygen.

如果我们有一些液态的过氧化氢，它会分解成水和氧气。

麻省理工公开课 - 热力学与动力学课程节选

"If you have an imbalance, or literally too much nitrogen and too much phosphorous getting into those systems, you can essentially deplete the oxygen in that water.

VOA: standard.2010.08.04

Carbon dioxide emissions decrease the amount of available oxygen in water in two ways.

FORBES: Carbon Emissions Threaten The Fishing Industry By Shrinking Fish Sizes

Anglers say the sudden drop in water levels mean that there is not enough oxygen in the water for the fish.

BBC: dead fish

And because the bacteria use oxygen in the water as they digest oil, scientists are concerned that process could cause an oxygen-depleted area underwater a "dead zone" that could choke off a variety of undersea life.

WSJ: Gauging Harm to Ecosystem Could Take Years