Parallel five-stage canal lock at the Three Gorges Dam in China.
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Previously:
https://www.homemadetools.net/forum/...206#post195822
https://www.homemadetools.net/forum/...515#post177886
https://www.homemadetools.net/forum/...631#post201476
https://www.homemadetools.net/forum/...046#post160660
https://www.homemadetools.net/forum/...668#post143534
