炼丹术 meaning in Chinese

alchemy
hermetic art

Alchemy and the copper - smelting in song dynasty
炼丹术与宋代冶铜业革命
The alchemy virtual library
炼丹术虚拟图书馆
In its search for an elixir of immortality , taoist alchemy developed both chemical experimentation ( wai - tan ) and a theoretical internal alchemy ( nei - tan )
为了寻找长生不老药，道教炼金术（炼丹术）既发展了化学实验（外丹），也发展了理论的内在炼金术（内丹）。
A medieval chemical philosophy having as its asserted aims the transmutation of base metals into gold , the discovery of the panacea , and the preparation of the elixir of longevity
炼金术，炼丹术中世纪的一种化学哲学。其声称的目标是将一些基本金属转变为金子，发现万灵药及制备长生不老药
Answer , first , why the heart thrills ; explain wherefore some plaintive note goes wandering about the world , undying ; make clear the rose s subtle alchemy evolving its ruddy lamp in light and rain
又有谁能解释为什么有些哀伤的曲子在世上广为流传，经久不衰？最后又有谁能说清是什么炼丹术使得玫瑰不分阴晴，总是鲜花满树，像红灯高挂枝梢？