These two angles are in a supplementary relationship.

He is good at playing percussion instruments.

My bed is very comfortable.

Detailed information is needed to understand the substance of this project.

I plan to go back to my hometown next week.

My new necktie is red.

Kazutoshi is my best friend.

He learned about substantialism in his philosophy class.

His dream finally became a reality.

He is working hard to substantiate that idea.