以下为句子列表：
英文: Taking into account the counteraction of the hub-airport to the flight route network, the paper presents the integrated optimization problem of one hub-airport siting and flight route network design.
中文: 考虑到枢纽机场建设对航线网络的反作用，提出了单枢纽机场选址与航线网络规划综合优化问题。
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英文: The force applied on front-wheel is discusced through an example in which tractor steering knuckle kingpin is tendency inside, and the returning positive moment acquired by front-wheel ground counteraction is also analysed.
中文: 摘要从车辆前轮的受力出发，以拖拉机转向节立轴内倾时为例，分析了前轮接地反力作用所产生的回正力矩。
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