科学家表示，主要原因是人类制造的机器把各类气体排放到空气中。
Scientists say that most of that rise is because of emissions, or gases, released into the air by machines that humans have built.
然后应用数学物理方法，经过一系列的数学演算过程，最后得出描述各类环形管网内气体不稳定流动规律的数学表达式。
After making a lot of mathematical calculations by use of the mathematical-physical method, the formulas describing the gas unsteady flow in various loop networks are obtained.
洛阳石化总厂五联合车间通过技术改造和加强管理，对各类有毒有害气体污染进行治理，环境保护取得显著成效。
No. five unit of Louyang Petrochemical Complex treated all kinds of harmful gas by technical reformation and environment management. Its environment protection has obtained remarkable effect.
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