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Sewage includes waste water and human excreta.
污水包括废水和人类粪便。
Inadequate disposal of human excreta is a major health risk in emergency situations.
在紧急情况下，人类排泄物的不适当处置是一个主要的健康危害。
An acceptable and practical system for the disposal of human excreta is the key to reducing health hazards.
减少健康威胁的关键在于建立可以接受的，实用的人类排泄物处置体系。
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