氮气中氧含量

содержание кислорода в азоте

大气气柱中的臭氧含量

содержание озона в атмосферном столбе

血细胞计数器一种仪器，用于计算一定量血液里所含血细胞的数量

An instrument for counting the number of blood cells in a measured volume of blood.

（湖泊等）优氧化的水中富有矿物有机物，有利于植物，特别是藻类的增殖，但藻类往往使分解的氧含量过低，从而使别的有机物灭绝。用于指湖泊或池塘

Having waters rich in mineral and organic nutrients that promote a proliferation of plant life, especially algae, which reduces the dissolved oxygen content and often causes the extinction of other organisms. Used of a lake or pond.