There is a close connection between pain and tension.

疼痛和紧张之间有紧密的关联。

But in fact they have close connection.

但事实上，他们有着密切的关系。

Vocabulary has a close connection with culture.

词汇与文化有着密切的联系。

This has a close connection with Chinese hermits.

究其原因，与中国古代隐士医学家有密切的关系。

The Greeks had close connection with modern society.

希腊文化与现代社会有紧密的联系。