Introductionsn.说明；介绍名词introduction的复数形式.introductionn.介绍；引进；序言；导论introduction and plantation引种造林Introduction to Climatology气候学引论Introductions and courtesie介绍和礼节Introduction to Photography摄影入门Introduction to Advertising广告入门Introduction to Corporation公司概论Introduction to E-Commerce电子商务概论Introduction of Memorial Day阵亡将士纪念日简介Introduction to Aes the tics美学概论Introduction to Architecture建筑学基础