1、for the purpose of Many people run for the purpose of losing weight. 5许多人为了减肥而跑步. 2、with the purpose of He went to town with the purpose of buying a new television. 他进城的目的是买一台新电视机. 3、for the sake of 为了.起见 I stopped smoking for the sake of my health. 为了我的健康起见我戒烟了. We ought to study hard for the sake of our motherland. 我们应该为了我们的祖国而努力学习.