... 乡界，区界，郡界 county boundary 行政区域示意图 county diagram 县界 county line ...
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D flow diagram that was built by means of system Dynamics, which is the developing and passing system of forest resources for a county.
本文提出用系统动力学的方法来研究森林资源消长，并为系统预测，建立和提供了一个县级森林资源消长模型和S、D、流程图。
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