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Chapter 331 Zheng He's Treasure Ship!
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... hovels, shovel nails, leech nails, etc., so that complex wooden structures can be easily assembled, hung and reinforced by various ship nails, so that they will not fall apart.
This point is not comparable to the bronze technology of the Great Qin Empire, so everything needs to wait until the great Qin iron smelting technology has made rapid progress before building Zheng He's treasure ship.
At the same time, Zheng He's treasure ship used a hard sail structure, and the sail surface ...
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