单词：activated sewage
activated sewage的用法和样例：
例句
- The river was contaminated with sewage.这河水被污水污染了。
- Sewage, however, is rather different.然而，污水则有所不同。
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污染物 aerosols气溶胶 / 气雾剂 agricultural wastes农业废物 asbestos石棉 commercial noise商业噪音 composite pollution混合污染 dioxins二恶英 hazardous substances危险物质 hazardous wastes危险废物 heavy metals重金属 h
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