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。
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