Our campaign's main purpose is to raise money.

我们这次活动的主要目的就是募款。

The main purpose of industry is to create wealth.

工业的主要宗旨是创造财富。

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。

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。

The main purpose is fresh and bright.

主旨鲜明。