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... at can be filled with or drained of water. By utilizing this waterway, ships can navigate through the entire river area, overcoming the water level differences created by the construction of reservoirs.

In the era where Qin Zheng originally lived, during the Qin Dynasty, there were already records of building ship locks.

However, the larger the ship lock, the more challenging it is to construct, and the higher the technical requirements.

Qi Guanghe felt like he had spille ...

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