The natural ecological cycle depends on plants, which absorb some pollutants and release oxygen to the air.
植物吸收了部分污染物质，并把氧气释放到大气中。
Furthermore, the ways about how to promote the economic recovery rapidly and how to keep the benign ecological cycle are put forward.
进而指出了既能促进尽可能快的经济复苏，又可保持生态环境系统良性循环的途径以及一些有关的政策问题。
By comprehensive utilization of biogas rural economics and eco - environmental sanitation can be improved and good ecological cycle can be formed.
开展沼气综合利用，能够促进农村生态环境的良性循环，改善农村环境卫生条件。
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