Chengde city has a complex terrain, mountains surounded, rivers staggered.

承德市境内地形复杂，山脉纵横，河流交错。

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The visualization of complex terrain is a common key issue among these applications.

这些应用中一个共同的核心问题就是复杂地形的地形地貌可视化的问题。

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It is important for micrositing a wind farm to master the distribution of wind energy in a complex terrain.

掌握复杂地形区域的风能分布对风电场微观选址至关重要。

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"It is complex difficult terrain, both the land and the people, it is a tribal society with a culture vastly different from what most of us are familiar with and it varies around the country, so you cannot assume what is true in one province is true in another,".

VOA: standard.2009.10.01

VAIL'S EXPANSIVE Back Bowls and Jackson Hole's heart-pounding, out-of-bounds terrain are just two reasons why the American ski scene has little reason to suffer an inferiority complex.

WSJ: Power Grub in Powder Hubs | Sites & Sightings