玄机直讲
张三丰
3 chapters·31,280 characters·Classical Chinese · Public Domain
所谓玄机，玄是指深不可测，机是指方法原理，玄机直讲，是把人们认为深不可测的原理明明白白地直接讲出来，以便掌握。这里要讲的是炼丹火候的方法及原理。
Chapters (3)
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