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这次讲台阶的故事。台阶似乎太平凡了。尽管人人都有上下台阶的经验 ,然而 ,很少有人去认真思索或考证过台阶的发明者及它的古今沿革
The story of the stairs. The steps seem too ordinary. Although everyone has the experience of going up and down, few people seriously consider or study the inventors of the stair and its historical evolution