I often go to the sea on weekends.

Umi is my best friend.

The sea breeze feels comfortable.

He found the sea on an old map.

He found the sea on an old map.

I love swimming at the seashore.

The concept of the absolute complement plays an important role in set theory.

Reading this supplementary explanation will deepen your understanding.

What is the complement of this sentence?

The complement system of the immune system plays an important role in eliminating foreign substances in the body.