A simple device,such as a lever,a pulley,or an inclined plane,that alters the magnitude or direction,or both,of an applied force; a simple machine.是什么意思_A simple device,such as a lever,a pulley,or an inclined plane,that alters the magnitude or direction,or both,of an applied force; a simple machine.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句