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Nobodyknowswhoinventedthepencilorwhenitwasinvented.ASwi...
问题详情:Nobodyknowswhoinventedthepencilorwhenitwasinvented.ASwiss(瑞士人)describedapencilinabookin1565.Hesaiditwasapieceofwoodwithlead(铅)insideilsweren’tpopularatthattime,andpeoplecontinuedtowritewi...