I use my boat mainly for leisure purposes. 我驾船的主要目的是为了休闲。

+of The purpose of this dictionary is to help students of English. 这本字典的用途是帮助学生学英语。

the purpose of doing sth The President’ s trip will have the purpose of negotiating a peace deal. 总统此行意在协商一项和平协议。

for the purpose of doing sth He went there for the purpose of making business contacts. 他去那里为的是进行生意上的联系。

sb’ s purpose in doing sth Her sole purpose in being here was to kill some time. 她到这里来的唯一目的就是消磨点儿时间。

suit sb’ s purpose You must decide which method suits your purpose best. 你必须找出达到目的最佳的方法。

serve a purpose (=achieve an aim) Another meeting would serve absolutely no purpose. 起到一种作用

defeat the purpose of sth (=make it impossible to achieve the aim that you want to achieve) Exercising too much defeats the purpose of doing exercise in the first place. 使无法达到某目的

Now his life lacks purpose. 现在他的生活失去了目标。

a sense of purpose The course gave her a new sense of purpose. 这门课程使她感到有了新的目标。

It would upset them both to no purpose. 那会莫名其妙地使他俩感到苦恼。

For all practical purposes there is no difference between them. 实际上两者之间并没有什么区别。

To all intents and purposes she is the boss. 实际上她就是老板。

For the purposes of this study, we ignored the responses of those with fewer than three children. 为了这项研究，我们忽略了那些少于3人的孩子的反应。

Did you do that on purpose? 你是不是故意那样做的？

They think the fire was started on purpose. 他们认为有人故意纵火。

She called after them to no purpose. 她在他们身后喊他们，却毫无作用。