求翻译：本文介绍了泸州沱江一桥复线桥工程方案设计过程中充分的考虑泸州旧城区的诸多限制条件，通过总结以往工程实例的成功经验，再经过多方面的分析比较，创新的提出了独特的桥梁解决方式。使得在桥梁的建设，合理地解决了在交通繁忙的旧城改造过程中的环境保护、历史文化的保留、建设期的交通保证以及节省投资等工程建设的复杂性问题。为城市旧城改造和建设，提供了一种新的思路和尝试。是什么意思？

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