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仔细考察,洞庭——江汉湖群的萎缩与湮灭的主要原因有二:一是围垦,二是淤积。二者均系人为造成。
Careful inspection, Dongting - Jianghan lake group shrinkage and annihilation for two main reasons: First, reclamation, and second, siltation. Both are man-made.