The students showed great interest after the professor gave a brief introduction to the course.

　　教授簡單介紹了這門課程之后，學生們表現(xiàn)出極大的興趣。

　　It's a useful introduction to an extremely complex subject.

　　這是對一門極為復雜的學科的有益入門教程。

　　This album was my first introduction to modern jazz.

　　這張專輯唱片讓我初次接觸了現(xiàn)代爵士樂。

　　On balance, the book is a friendly, down-to-earth introduction to physics.

　　總而言之，這是一本通俗而務實的物理入門書。

　　Ecuador provides a perfect introduction to South America; it's a continent in miniature

　　厄瓜多爾是認識南美洲的絕佳切入點，它是南美大陸的縮影。