(1)自然要素
指水、火、土、风这四大要素，古代人们认为这四种元素是构成整个世界的基本物质。　

(2)自然力
指由自然要素构成的各种现象，特别是恶劣的天灾，如洪水、龙卷风等，有时被认为是上帝所为。

• official receivers
• official record
• Official Records Act
• Official Records Statute
• official referee
• Official Register
• official reporters
• official reports
• official rules
• official seal
• official secrets
• Official Solicitor
• Official Trustee of Charitable Funds
• Official Trustee of Charity Land
• Official Trustees of Charities
• official use
• official visitors
• Officia magistratus non debent esse vennalia.
• officiariis non faciendis vel amovendis
• Officina Justitiae
• officio
• officious will
• Officit conatus si effectus sequatur.
• officium
• Officium nemini debet esse damnosum.