富氧的底层洋流作用导致底层水含氧量增加是红层形成的主要原因。
Intensive circulation of bottom waters with higher contents of dissolved oxygen may have caused the formation of the CORBs.
文中首先对上述各因素对凝汽器最佳真空的影响进行了分析，给出了凝汽器真空变化后凝结水过冷度及凝结水含氧量的计算方法。
In this paper, the influences of these factors on the optimum vacuum are analyzed firstly, and the calculation method of condensate subcooling degree and the dissolved oxygen in condensate are given.
这两处地区水的含氧量不足以维持鱼类的生存。
这类水来源于地下水源，含氧量很低，还含有大量硫和其它化学物质。
This type of water comes from underground sources and has low levels of oxygen, yet high amounts of sulphur and other dissolved chemicals.
去年十月，联合国环境署宣布扬子江及珠江入海口为死水区。这两处地区水的含氧量不足以维持鱼类的生存。
In October, the United Nations Environment Program declared the Yangtze and Pearl River estuaries dead zones. The water doesn't have enough oxygen in it to support fish.
它能适应含氧量少的水。
它能适应含氧量少的水。
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