The third part describes the actuality of geographical population distribution of Chengdu's "Three Big Circle".
第三部分描述成都市“三大圈层”的人口地理分布现状；
Influence factors of malaria epidemic were investigated, including population features, geographical distribution, epidemic focus and intensity, and the species of Anopheles.
调查影响疟疾流行的人群及地理分布特征，暴发点分布、流行程度等社会、经济和自然因素，以及媒介按蚊的种群和密度。
Based on migration of population and change of administrative area and geographical environment of islands etc, the thesis analyzes the distribution characteristics and the shaping of dialect.
文中从人口迁移、行政区的变动和海岛的地理环境等方面，对方言的分布特征与形成条件进行了分析研究。
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