The purpose of intelligence is to provide information on how the enemy can be beaten

　　諜報的目的是提供如何打敗敵人的信息。

　　The main purpose of industry is to create wealth.

　　工業的主要宗旨是創造財富。

　　One has to ask oneself what the purpose of the exercise is.

　　大家必須問一問自己，這個鍛煉的目的是什么。

　　The purpose of the book is to provide a complete guide to the university.

　　本書旨在全面介紹這所大學。

　　The purpose of the journey is to mobilise public opinion on the controversial issue

　　此行的目的就是動員公眾對這個備受爭議的問題發表意見。