"Cogs?" Evil Moon asked, puzzled.

It's not that Douluo Continent doesn't have gears, it's just that he hasn't touched it.

It's like the gate of Wuhun City, which weighs 10,000 catties, and it is impossible to push it by relying on manpower. In wartime, even if there are many people, it is useless.

The real power source for turning the city gate is through two huge waterwheels in the inner city, driving the transmission shaft to output power through gears, and one waterwheel controls a city gate.

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