以下为句子列表：
英文: Cost-benefit ratio model and stage-rolled method are chosen as the theoretical foundations of the program, and then benefit model is improved to accord with the actuality of urban traffic in China.
中文: 首先选择效益／费用比模型和阶段滚动法作为程序的理论依据，同时针对我国城市交通的现状，对效益模型进行了改进。
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