The water security idea is the basic economics grounds of the city water resource protection and the water expending pricing.
水安全思想是城市水资源保护和水消费定价的基本经济依据。
The water security idea is the basic economics grounds of the city water resource protection and the water expending pricing.
水安全思想是城市水资源保护和水消费定价的基本经济依据。
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