It was once thought that lead could be transmuted into gold.
有人曾经认为铅可以变成黄金。
After experimenting for eight days, he discovered that firing powdered graphite with clay would work, and the hardness of the pencil lead could be varied by varying the ratio of graphite to clay.
他做了八天实验，发觉把石墨粉末和黏土一起烧，就可奏效。笔芯的硬度还会依石墨和黏土的比例而改变。
Ancient alchemists believed that, under the correct astrological conditions, lead could be "perfected" into gold.
古时候的炼金术士相信在正确的占星术情况下，铅会“完美地”转变为黄金。
Ancient alchemists believed that, under the correct astrological conditions, lead could be "perfected" into gold.
古时候的炼金术士相信在正确的占星术情况下，铅会“完美地”转变为黄金。
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