In recent years, China's water pollution problem has become a cross-regional, inter-basin complex problem.

近年来，我国水污染问题已经成为了跨区域，跨流域的复杂问题。

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The outline of geotectonic and geomorphology of the Central Asia is characterized by range and basin complex. All the closed basins develop tail-end-lake (or lakes).

亚洲中部大地构造格局及地貌轮廓均以山盆体系为特征，所有封闭性盆地中都发育有尾闾湖。

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The Permian Wuerhe Formation in the northwest margin of Junggar Basin is a complex petroleum system with both source rocks and reservoir rocks.

准噶尔盆地西北缘二叠系乌尔禾组地层是既有烃源岩又有储集岩的复合含油气系统。

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The agreement calls for the water system to be treated as a single complex ecosystem made up of countless tributaries, underground aquifers and smaller lakes all held in the Great Lakes basin.

NPR: Governors Meet on Access to Great Lakes