Ming and Qing Dynasties, when the sound system as a moat to protect city, provide convenience for residents of the important sources of water. Second, the urban development of the environmental impact of water.

  • 明清时护城河体系的完善成为保护城池、方便居民用水的重要水源。第二,城市发展对水环境的影响。

  • 互联网 2025-03-14 21:35:10

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