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The stable isotope composition indicates that their rock-forming fluid is the seawater, meteoric water or primary water.

稳定同位素特征表明其成岩流体为海水、大气成因水或原生水。

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There is an intricate phenomenon that the content of primary water is high in sandstone gas reservoir with low-permeability, but several gas wells can produce water.

低渗透砂岩气藏一般原生水饱和度高，气藏显然没有水层但产水较大，这种现象很难解释。

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The U.S.Environmental Protection Agency,or EPA, lists stormwater as the primary cause of water pollution in the United States, and encourages local communities to develop management plans to treat run-off before it pollutes their rivers, lakes or streams.

VOA: standard.2010.08.04

Do you now rely or have you ever relied on well water as your primary water source?

CNN: Basal cell carcinoma

Agricultural cultivation consumes the largest share of water in the Arab region and is a primary source of water stress.

UNESCO: EDUCATION

Thus, protecting the Kissimmee River, the primary source of water for Lake Okeechobee and the Everglades, has become a paramount goal for conservationists.

BBC: Florida��s newest wildlife refuge