解决城市交通出行困难的问题，建立多模式绿色交通体系是必然选择。
To relive urban traffic congestion, it is necessary to promote non-motorized green travel alternatives.
城市轨道交通已成为缓解城市交通紧张和实现高效、便捷和绿色环保交通体系的有效措施。
Urban transit is a powerful tool for solving traffic difficulty, and now it has become an efficient, convenient and green transportation system.
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