Doorknob
A wheel and axle is a simple machine.
It makes work much easier.
A doorknob is a wheel and axle.
The doorknob makes it easier to open the door.
Doorknob
A wheel and axle is a simple machine.
It makes work much easier.
A doorknob is a wheel and axle.
The doorknob makes it easier to open the door.
A wheel and axle is a simple machine. It makes work much ...
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Doorknob A doorknob is a simple machine. It is a wheel an...
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本文标题：A simple machine in my life—door
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