接下来，我们将构造主要区域，所选择的提要将在该区域呈现。
Next we construct the main area where the selected feed is presented.
作者认为经济区域即是具有核心构造和具备某种经济职能的地理区域。
Author define economic region a geographical area with a nodal structure and an economic function.
它代表了本区的最新构造活动，是区域构造演化的产物。
研究区洞群洞腔发育受区域构造裂隙的控制，与地下水文网的关系密切；
The development of the caves is in close connection with underground drainage network;
研究区洞群洞腔发育受区域构造裂隙的控制，与地下水文网的关系密切；
The development of the caves is in close connection with underground drainage network;
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