There is a certain relation between urbanization and urban eco-environment.
城市化与城市生态环境之间存在着一定的关系。
There is a certain relation between safety cost and the main safety indexes.
安全投入与主要安全指标之间存在一定的函数关系。
There is a certain relation between the porosity and the average grain diameter.
平均粒径与孔隙率存在一定关系；
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