waste water - water that contains waste from homes or industry, sanitation - clean water and toilets, dignified - to behave in a calm, serious, and respectful manner, ecological - related to nature and environment protection., scarce - in short supply, rare, urban - >< rural, typhoon - a tropical storm in the region of the indian or western pacific oceans, effort - hard work; a serious attempt, approach - strategy, also: coming near to someone or something, to leak - lose liquid through a hole or crack,

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