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MTL - Ask Sword - Chapter 146 equipment
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... id: "For example, there is a layer of water in the middle, and the wind pushes the water, and the water then presses the piston to make it move back and forth."
He paused, and hastily added: "Of course I don't understand very well, I just said it casually."
"Do you use water as the medium?"
A group of doctors pondered and discussed.
"Water is hard to compress, maybe doable."
"But how to control the water splashing under the action of wind?"
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