也许是考虑到探究的难度,教材上回避了“力臂”概念的探究,直接给出“力臂”定义.但是这样做的弊端也是显而易见的:由于学生没有体验到建立“力臂”概念的思辨过程(理解的“空心化”),导致他们应用上的认知背叛(应用的“返祖化”):一旦遇到较复杂情形,依然用他 Perhaps taking into account the difficulty of inquiry, the textbook avoids the exploration of the concept of “arm” and directly gives the definition of “arm.” But the drawbacks of doing so are also obvious: since students do not experience the establishment of “ (”Hollowed“), resulting in cognitive betrayal of their application (applied ”reenactment"): in the event of more complicated situations, still use him