《Tetrabiblos》Knowledge May Be Acquired By Astronomy To A Certain ExtentClaudius Ptolemy（Ashmand 英譯 1822）
2. The world is divided into two parts, the elemental region and the æthereal. The elemental region is constantly subject to alteration, and comprises the four elements; earth, water, air and fire.
段落 tetra-1-knowledgem-3public-domain (Ashmand 1822)
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