求翻译：在自然条件下，通过140天运行，考察了模拟系统对生活污水总氮、氨氮、硝酸盐氮、亚硝态氮等参数在系统垂直沿程的分级净化效果。是什么意思？

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Under natural conditions, through 140 days, inspected the analog system running on sewage total nitrogen, ammonia nitrogen, nitrate nitrogen, nitrosamines parameters such as nitrate nitrogen in the system vertical along the graded purification effect.

Under the natural condition, through 140 days movements, inspected the analogous system to parameters and so on sanitary sewage total nitrogen, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen has been vertical in the system along the regulation graduation purification effect.

Under natural conditions, operating over the 140 days, inspected the simulation system for domestic wastewater ammonia nitrogen, nitrate nitrogen, total nitrogen and nitrate parameters such as Asia in grading along the vertical effects of the system.

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