Some of them, such as nitrogen, oxygen, argon, neon, and so on, may be regarded as permanent atmospheric components that remain in fixed proportions to the total gas volume.
其中一些气体，如，氮，氧，氩，氖等，作为空气的永久组成成分，总是以固定的比例存在于大气中。
Although PM2.5 is only a few components content of earths atmospheric composition, but it has important effect on visibility and air quality etc.
虽然PM 2.5只是地球大气成分中含量很少的组分，但它对空气质量和能见度等有重要的影响。
Stepped cascades are used also in water treatment plants to enhance the air water transfer of atmospheric gases and volatile organic components.
台阶水道还可用于水处理工厂，促进空气中的气-水交换和有机质的挥发。
Stepped cascades are used also in water treatment plants to enhance the air water transfer of atmospheric gases and volatile organic components.
台阶水道还可用于水处理工厂，促进空气中的气-水交换和有机质的挥发。
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