For example:

1, a string should be unique for the article.

This string should be unique to the article.

2. Other environment variables may be unique to the application.

Other environment variables may be specific to an application.

Say, "This field is unique and unique."

For example:

To me, you will be unique in the world.

In my eyes, you are unique in this world.

2. This can be said to be unique in Shenzhen.

This can be said to be unique in Shenzhen.