重度受害林分内幼虫表现较强的空间聚集性，而轻度受害林分则表现为随机分布。
Intense spatial aggregation of larvae was observed in the heavily-infested woodland, while random distribution was observed in the lightly-infested one.
北京市海淀区HFRS病人的分布为非随机分布，具有时间和空间聚集性分布的特征。
HFRS patients in Haidian district of Beijing were not distributed randomly, and the temporal and spatial clusters were obvious.
回归分析证明，成本因素、聚集经济的外部性和路径依赖作用在空间演化过程中起到了决定性的作用。
The factors of production costs, externality of agglomeration economics and path dependence played crucial roles in the process of spatial evolution of FDI.
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