"Yes, the gray can be used not only to build cities and roads, but also to build bridges."

Lu Su was pleasantly surprised.

Whether it's Jiangdong or Jingzhou, there are many waters.

At this time, some of the water areas were very difficult to exploit.

Even if there are bridges, most of them are wooden bridges, and even if there are stone bridges, there are not many of them, and the construction process is troublesome.

But looking at the blue-gray bridge in this small room, it seems to ...... It's not that much trouble.

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