After learning magical knowledge, Zhao Cheng was like a madman, writing and drawing on white paper like crazy.

There are many unattainable machines that can be easily implemented with the lever principle.

Trolleys, lever wells, long handles of scissors......

He is a natural prodigy, and after learning the principle of leverage, he has rectified many tools.

......

"I Really Don't Want to Be an Emperor" Chapter 153 Epoch-making is in the middle of the hand, please wait a moment,

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