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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The invention relates to a system and an application which can precisely control the content of dissolved oxygen in water.

本发明涉及一种可精确控制水中溶解氧含量的系统及应用。

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The dissolved oxygen in water are increased with wind and waves, thus there is an even distribution of DO in the water layers.

风浪增加了水体中DO浓度，并且使各个水层中的浓度较一致。

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Nutrient overloads lead to low levels of dissolved oxygen in the water, which can kill fish.

WSJ: Connecticut Seaweed: Life Down on the Kelp Farm

Levels of dissolved oxygen in deep water have dropped about 20 percent below their long-term average, according to data collected from up to 60 miles from the well at the center of the worst oil spill in U.S. history.

CNN: No signs of 'dead zone' in Gulf, feds say