医疗资源的不平衡使越来越多的专家集中在大城市大医院。
The disequilibrium of medical resources makes more and more experts centre in the large hospital of the big city.
结合云南省普通高校分布与云南省各地区人口分布的分析，可以看出云南省高校分布的不平衡性，即高等学校大部分集中在昆明，各地州高校数量较少，层次低。
The unbalanced distribution of higher education in Yunnan at the present situation is most of the colleges and universities are centralized in Kunming more than the local regions.
目前国际上对类别不平衡数据的研究主要集中在两个个层面：对数据集的处理和对分类算法的改进。
At present, researches on class imbalance problems mainly focus on two aspects: dataset processing and classification method improving.
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