核心分布 meaning in English

clumping distribution

Secondly , the paper reviews the evolution of the scale structure of towns in county administrative areas . the spatial structure show changes from concentration to political regional balance , and changes to the grade - size differentiation . based on the cases , it summarizes four models : single - centre model , double - centre model , group - centre model and urban - radiation model
其次，总结全省县域城镇规模结构的演变，划分出密集化向均衡化再向等级化的阶段变迁，并结合具体案例归纳县域城镇空间分布的四种主要模式：向心集中型、双中心分布型、多核心分布型和城市辐射型。
The results of the investigation in forests showed that dastarcus helophoroides adults displayed a core distribution pattern , that belonged to aggegated distribution , and changed to mosaic distribution pattern in a denser population due to the exclusion behavior among the individual in host competition
摘要林间调查和研究表明，花绒坚甲成虫的分布格局为聚集分布中的核心分布型，在群体密度较大时，由于个体间具有竞争寄主的排斥行为，其分布则转变为嵌纹分布；花绒坚甲在进入新的分布区后，首先是建立大小不等的聚集群，再以聚集群体的形式向周围扩散。