Introductionsn.说明；介绍名词introduction的复数形式.introductionn.介绍；引进；序言；导论Introduction to Earth Science地球科学概论Introduction of Earth Science地球科学概论Introduction to Resources Law资源法概论Introduction to Space Physics太空物理学导论Introduction to Advertisement广告概论Introduction and preservation引种保存Introduction of Cinco de Mayo抗法胜利纪念日简介introduction and establishment传入和定殖introduction of westem culture西方文化导入Introduction and arboriculture引种驯化