A reservoir is built in housetop, have structure of wall of edaphic lay aside, some of alga, fish is put inside, form small-sized ecosystem with assuring water quality fresh.

在屋顶建设一个蓄水池，有土壤贮壁结构，里面放些藻类、鱼类，形成小型生态系统以保证水质的新鲜。

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Tips: Fresh seafood is adequate in weight without adding any water, and it is fresh, sanitary and of good quality and cheap in price.

友情提示：新鲜海产品不掺水、足斤足两、新鲜卫生、质优价廉，并免费为您清洗；

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Because of the shortage of fresh water and the competition of the industry, it increasingly depends on the pool-quality water (saline water or city sewage) in agriculture produce.

淡水资源的短缺和工业用水的竞争，使农业生产对劣质水(咸水或城市污水)利用的依赖性日益增加。

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