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(d) simple artificial systems, such as constructed oxidation ponds, constructed wetlands, sand-filtration beds, bioremediation plants and aquaculture systems, designed to settle or filter out the solids and oxidize the organic materials;
(d) 为沉淀或过滤固体物质和氧化有机物质而设计的简单人工系统,例如人工氧化池、人工湿地、过滤沙层、生物修复厂和水产养殖系统;