building drainage systems
Cleaning out swamps and filth. Purifying water. Building drainage systems.
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building drainage systems
建筑物排水系统
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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According to experiment data and relevant material, water in the building water supply systems suffers contamination to different extent, so water wastes as a result of polluted water drainage.
实验数据和有关资料表明，水在建筑给水系统中受到了不同程度的污染，不合格水的外排，导致了水量浪费。
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