Drawing lessons from available research achievement, the induction is presented about the mechanism of multi-ring roads development.
借鉴多层环路系统已有研究成果，归纳其形成机理。
Drawing lessons from available research achievement, the induction is presented about the mechanism of multi-ring roads development.
借鉴多层环路系统已有研究成果，归纳其形成机理。
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