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笔记：graphite /'græfaɪt/ n. 石墨铅笔芯的重要组成部分就包括石墨，it's a naturally soft black material and clay is mixed with it to make it harder. A pencil lead is made from graphite mixed with clay. 铅笔芯是石墨混合粘土做成的。获取节目完整音频、笔记和片尾的歌曲名，请关注微信公众号「早安英文」，回复“笔记”即可。更多有意思的英语干货等着你！
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