Chapter two, city scale benefit analysis and comparison.
第二章，城市规模效益分析与比较。
Through analysis and comparison, some conclusions are obtained.
通过分析比较，得出了几点结论。
ITA then keeps an up-to-date database of all this flight information for analysis and comparison shopping.
ITA拥有实时更新的航班信息数据库，以便进行分析和对比选择。
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