Scientific work is differentiated from art by its necessary connection with the idea of progress.

科学工作不同于艺术在于它与进步的概念有必然联系。

《柯林斯英汉双解大词典》

There we can see a necessary connection.

在这里我们可以发现必要的关联。

youdao

And there is no necessary connection between the balls being there and my seeing them.

台球的运动,和我的目光之间没有必要的联系。

youdao

This raises a question. Whether the relation between contemporary political science and liberalism is merely accidental or whether there is some intrinsic some necessary connection between them.

这导出一个问题，当代政治科学,与自由主义的关系仅是偶然,或之间，有些本质的,一些必然的,连结介于两者之间。

耶鲁公开课 - 政治哲学导论课程节选

Lynch warned against making a necessary connection between QE and the value of the yen.

FORBES

In reality, there is no necessary connection between them.

BBC: Row erupts over 'easier' subjects claim

The police authority said it believed no further action was necessary in connection with the first email.

BBC: Mike Bull