煉丹八卦爐 [ㄌㄧㄢˋ ㄉㄢ ㄅㄚ ㄍㄨㄚˋ ㄌㄨˊ; lian4 dan1 ba1 gua4 lu2] eight trigrams furnace to cook pills of immortality symbol of the alchemist's art Double, double toil and trouble, Fire burn, and cauldron bubble ◄ ►