单词：plumbago
[医] 石墨
plumbago的用法和样例：
例句
- Later Thoreau converted the factory to producing plumbago, used to ink typesetting machines.随后梭罗让工厂转换生产适用于油墨排版机的石墨粉。
- graphite石墨
- black lead石墨(笔铅)
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