方法本专题采用的研究方法包括：疾病动态监测、危险因素动态监测、横断面研究、前瞻性观察、生态学比较和模型预测等流行病学方法。
Method The study methods of this project included dynamic disease surveillance, multiple risk factors examinations, cross - sectional and prospective study, and modeling of predictive models, etc.
比较两种分子生物学方法的结果表明，PCR TGGE技术比pcr RFLP技术更能精确地反映土壤微生物的动态变化，并且能同时快速地对多个样品进行有效区分。
It also manifested that PCR-TGGE is superior to PCR-RFLP for detail dynamics of soil microbial community, and it is a rapid method to discriminate multiple samples simultaneously.
目前，研究区域物流系统的有效方法与手段还比较少，而系统动态学与区域物流系统相结合的研究方法更是一种新的尝试。
At present, there are few effective ways to do research on area logistics system, and it is a try to combine the area logistics system with system dynamics.
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