These natural disasters often brong huge casualties and economic losses on human being .
这些自然灾害往往给人类社会造成巨大的人员伤亡和经济损失。
The third chapter mainly discuss two kind of factor brong influence after Northern Wei moving the capital to Luoyang .
本文的第三章主要论述了北魏迁都洛阳之后对这胡、汉两种因素所带来的的影响：即迁都遗弃了那些胡族和胡化程度较深的人口；
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