经过一段时间后，废物累积到某一个水平，并压实，这样做是为了节省空间，并减少废弃物的总量。
After some time, the wastes accumulate at a certain level and compaction is done to save on space and to reduce the waste's overall volume.
通过对扬州市危险废弃物环境管理现状的分析，提出了加强危险废物环境管理的几点措施。
After analyzing the current situation of environmental management on dangerous wastes in Yangzhou City, this paper proposed several measures to strengthen dangerous waste management.
电子废弃物种类繁多、成分复杂，含有多种有毒、有害物质，已成为固体废物中最大的重金属污染源。
Electronic waste contains different kinds, components and poisonous substances; it has become the largest pollution source of heavy metal in the solid waste.
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