He is enriching his sentences by using antonyms.

I own the copyright of this book.

He resisted his parents' orders.

Don't forget to bring your mess tin when you go camping.

The radius of this circle is 5 centimeters.

He is our squad leader.

Let's define the range of this project.

This book is out of copyright, so you can copy it freely.

Let's learn the method to derive the initial letter of a mora using a semi-voiced sound mark.

The Korean Peninsula is located in East Asia.