Epidemicity yellow fever assaults , Houston early phase develops slowly since being located in many muddy swamps and being suffering, be to transport the cotton harbour only.

由于地处多泥泞沼泽和遭性黄热病袭击，休斯敦早期发展缓慢，仅为运港口。

Based on a 8-year surveillance data,a factor analysis theory was used to analyze the 12 risk factors influencing the epidemicity of epidemic cerebrospinal meningitis.

应用因子分析理论，结合随州市8年来的测资料，对影响的12个因素进了研究。