第四部分农村合作运动。
农村合作运动与近代乡村社会的变迁有着一定的互动关系。
Certain interactive relationship exists between the rural cooperation movement and the transition of modern rural society in contemporary countryside.
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；
The North China rural cooperation movement should be its historical source;
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