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How does civilization 6 unlock the canal?

1. Build a canal connecting two waters, which can be a river, a lake or an ocean.

2. Choose an engineer to focus on the canal construction, so as to speed up the canal construction.

3. Make sure that the heights of the two waters are equal, otherwise it is necessary to build a sluice to control the water level.

After completion, the canal will shorten the sailing distance of ships and improve the efficiency of trade and transportation.