Simple machines
2019-03-20 本文已影响0人
your爸爸
Lever is a kind of simple machine.
It makes work much easier.
A scissor is a lever.
It makes it easier to cut things.
scissors
scissors
scissors
Lever is a kind of simple machine.
It makes work much easier.
A scissor is a lever.
It makes it easier to cut things.
scissors
