As a public utility, water supply industry has the particularity itself-natural monopoly and social commonweal, which is not in the general companies' possession.

供水行业作为社会公用事业，其自身具有通常意义的企业所不具有的特殊性—自然垄断性及社会公益性。

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The utility model does not increase the possession area of the computer room, thus it can save land occupation greatly.

本实用新型完全不用考虑增加机房占有的面积，极大地节省了占地。

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