A legendary method of Qigong cultivation or Taoist alchemy, referring to the process of refining an elixir or internal energy through repeated cycles to achieve transformation or immortality.
他研习古籍，希望通过“七返还丹”的奥秘，达到身心合一的境界。
He studied ancient texts, hoping to achieve a state of mind-body unity through the mysteries of "seven returns and restores elixirs."
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