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for subject
Water resources
containing
卫生
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in specified order only
Chinese
English
世界
卫生
组织水安全计划
Water Safety Plans
(WHO)
卫生
设施
sanitation
卫生
饮水
wholesome water
水域环境
卫生
water area environmental sanitation
水源环境
卫生
防护
sanitary protection of water source
污水
卫生
化学分析
sanitary chemical analysis of sewage
饮用水
卫生
标准
sanitary standard fbr drinking water
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