Lu Er gently turned the gear, the cylinder of the internal combustion engine circulated compression, and the flywheel rotated on the other side.
Click, click.
Various types of pistons, connecting rods and crankshafts are constantly running, giving them a unique mechanical beauty.
Lu Er couldn't help but burst into laughter.
Once the internal combustion engine is made, he will finally no longer have to stay here and can go to the imperial capital in Central Plains to visit his master.
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