炼丹术

zhān xīng xué hé liàn dān shù wèi shén mì zhī xué

占星学和炼丹术为神秘之学。

Astrology and alchemy are occult sciences.

bù shǎo xué zhě rèn wéi zhè yuán yú gǔ dài de liàn dān shù hé liàn jīn shù

不少学者认为这源于古代的炼丹术和炼金术。

Some of them believe that it comes of ancient alchemy and spagytism.