亲爱的儿子:你知道不知道这样一个故事:亚里山德拉大图书馆被烧之后,只有一本书被保存了下来,但并不是一本很有价值的书,于是一个识得几个字的穷人用几个铜板买下了这本书。这本书的内容并不怎么有趣,但里面却有一个非常有趣的东西——窄窄的一条羊皮纸上面写着“点金石”的秘密。点金石是一块小小的石子,它能将任何一种普通金属变成纯金。羊皮纸上的文字解释说,点金石就在黑海的海滩上,和成千上万与它看起来一模一样的小石子 Dear Son: You know you do not know such a story: only one book has been preserved since the Alexandria Library was burned, but it is not a very valuable book. So one who knows a few words The poor bought the book with several copper plates. The content of this book is not very interesting, but there is a very interesting thing inside - a narrow parchment with “lithe ” secret. Point stone is a small stone, it can be any kind of ordinary metal into pure gold. The text on the parchment explains that litmus is on the beach of the Black Sea, with tens of thousands of pebbles that look exactly like it