![Nobodyknowswhoinventedthepencilorwhenitwasinvented.ASwi...]( "Nobodyknowswhoinventedthepencilorwhenitwasinvented.ASwi...")
- 问题详情：Nobodyknowswhoinventedthepencilorwhenitwasinvented.ASwiss(瑞士人)describedapencilinabookin1565.Hesaiditwasapieceofwoodwithlead(铅)insideilsweren’tpopularatthattime,andpeoplecontinuedtowritewithpens.In1795,someonestartedmakingpencilsfromgraph...
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