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1·Our campaign's main purpose is to raise money.

我们这次活动的主要目的就是募款。《牛津词典》

2·The main purpose of industry is to create wealth.

工业的主要宗旨是创造财富。《牛津词典》

3·The main purpose of his holiday to Greece was to go diving.

他到希腊度假的主要目的就是去潜水。《牛津词典》

4·Its main purpose is to make life easier for humans.

它的主要目的是让人类的生活变得更舒适。

5·The main purpose of the advertisement is to attract more book buyers.

广告的主要目的是吸引更多的购书者。

6·The main purpose of the charity project is to offer help to homeless people.

这个慈善项目的主要目的是为无家可归的人提供帮助。

7·What's the main purpose of this article?

这篇文章的主要目的是什么？

8·What is the main purpose of this webpage?

这个网页的主要目的是什么？

9·The main purpose is to let enough time pass so the two people are sure that they want to marry each other.

主要目的是让他们相处足够久的时间，让两个人确定他们的结婚意向。

10·As is known to all, the main purpose of school education is to have students in preparation for their future.

众所周知，学校教育的主要目的是让学生做好准备应对未来。