宁夏中部风沙区的沙质荒漠化在历史时期，尤其是本世纪50年代以来，具有明显扩展的趋势。
There is an obvious developing tendency of sandy desertification in the blowing sand region of middle Ningxia in historical time, especially since 1950's.
宁夏中部风沙区的沙质荒漠化在历史时期，尤其是本世纪50年代以来，具有明显扩展的趋势。
There is an obvious developing tendency of sandy desertification in the blowing sand region of middle Ningxia in historical time, especially since 1950's.
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