A simple machine in my life
2019-03-28 本文已影响0人
岳易Yue
Doorknob
A simple machine in my life
A doorknob is a simple machine.
It is a wheel and axle.
It makes it easier to open the door.
A simple machine in my life
A simple machine in my life
Doorknob
A simple machine in my life
A doorknob is a simple machine.
It is a wheel and axle.
It makes it easier to open the door.
