📁 炼金术
Historically, alchemy is based on the ancient belief that all matter consists of various mixtures of four basic elements: Earth, Air, Fire and Water. In current usage, any chemistry based on ancient principles rather than modern physics may be included.
条目 (1+)
Management of Problematic Aquatic Weeds in Africa
http://www.fao.org/DOCREP/006/Y4270E/Y4270E00.HTM