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铅笔芯是怎么被塞进木头里的？用了这么多年后明白了
source link: https://tech.sina.com.cn/d/2019-03-29/doc-ihsxncvh6460920.shtml
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来源：科学加|狂丸科学铅笔，作为我们最早接触的书写工具，它随时可擦，携带方便，小学的时候笔盒里总是放着好几只备用，以防数学题做不出来，一生气就把它掰断了。可狂丸用了这么久，每次手握铅笔的时候，都很好奇里面的笔芯到底是怎么被塞进外面那层木头里
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