roller \pulley \wheel 这三个单词都是轮子的意思，有什么区别 5
roller\pulley\wheel我想请教一下这三个单词都有轮子的意思，应该如何分辨使用，请指点，谢谢！...
roller \pulley \wheel我想请教一下这三个单词都有轮子的意思，应该如何分辨使用，请指点，谢谢！
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A roller is a machine that helps moves objects along a surface but is not attached to the object.
A wheel is attached to the object that it is trying to move.
A pulley is used to lift a heavy load without using as much force as would normally be needed.
A wheel is attached to the object that it is trying to move.
A pulley is used to lift a heavy load without using as much force as would normally be needed.
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