The North China rural cooperation movement should be its historical source;
华北农村合作运动应该是我国农村合作医疗实验的历史源头；
In modern North China rural area active changes appear in their dietary field.
在近现代以来的华北农村，人们的饮食领域出现了一些积极的变化。
Objective To explore the relationship between food intakes and blood pressure in rural inhabitants of North China.
目的探讨食物摄入与血压之间的关系，为农村地区高血压的防治提供科学依据。
In modern times the education in rural area of the north China had experienced great changes from the old style to the new style and the educational organization had changed as well.
近代华北的乡村教育，经历了由旧式教育至新式教育的转变，其组织形式也发生了巨大的变化。
In rural area of modern North China, the stock capital Shared a very small part in the whole agricultural capital, and had a different distribution among farmers and peasants.
在近代的华北农村，农具资本在农业资本中的比例很低，而且分布不均。
Methods A cross-sectional survey was conducted among 25~55 years old rural residents in villages with former blood donors in north of Anhui of in China.
方法采用整群抽样方法，在安徽省北部地区既往卖血人员比较集中的村，对25~55岁的村民进行调查，包括问卷调查和艾滋病病毒抗体实验室检测。
So large Numbers of victims of natural calamities flowing into the city from rural area of the North China as a result of nature disasters frequently, were the main source of the urban poor.
近代华北自然灾害频仍导致灾民大量流入城市，是贫民阶层的主要来源。
So large Numbers of victims of natural calamities flowing into the city from rural area of the North China as a result of nature disasters frequently, were the main source of the urban poor.
近代华北自然灾害频仍导致灾民大量流入城市，是贫民阶层的主要来源。
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