素问．刺禁论篇第五十二

plain washer

plain carbon steel

Plain Questions 47, Treatise on Strange Diseases

plain steel

Plain Questions 70, Great Treatise on the Five Normal Rules

Plain Questions 74, Great Treatise on the Essentials of Supreme Truth

Plain Questions 30, Treatise on Heat

Plain Questions 10, Treatise on the Engenderment of the Five Viscera