黄河流域水资源匮乏，径流年内、年际变化大，且地区分布不均匀。
The water resource is insufficient and unevenly distributed in the Yellow River Basin, with great changes in annual and inter-annual runoff.
海河流域暴雨以空间分布悬殊、时间分配集中、年际变化大而著称。
The rainstorm of the Haihe Vally is known for its great disparity in spatial distribution, its concentration in time distribution, and its great annual variations.
本文论述了安徽省降水量不均匀性的主要表现特征——区域分布不均、季节变化明显和年际变化大；
The paper discusses the main features of amount of irregular precipitation in Auhui province -regional distribution unequelity, evident seasonal variation and great variation between years.
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