孩子提了一个问题:锯木头用锯子,切菜用菜刀,为什么锯子要是锯齿状的菜刀却是平�的。文�生求大神指教! 知乎 Template




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tomski孩子提了一个问题:锯木头用锯子,切菜用菜刀,为什么锯子要是锯齿状的菜刀却是平�的。文�生求大神指教! 知乎 coloring