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... Bearings? Not...a belt? Shouldn't be...
By the way, it's a gear!
A simple combination of large and small gear sets can increase or decrease the speed of rotation, and the traction force is consistent during the rotation of the gears, but what should the gear be called in the Han Dynasty?
Fei Qian didn't know how to express it clearly, so he simply drew a schematic figure on the ground, and said to Huang Chengyan: "Master Yue Zhang, please see, if this water cone is modi ...
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