The barnacle is a type of marine creature that firmly attaches to rocks and the bottoms of ships.

This rock has been here for hundreds of years.

This is a kind of flower.

This tape has a strong adhesion.

This sticker will adhere to the surface immediately.

He gripped my hand tightly.

His life is firmly stable.

He closed the door firmly.

The study of benthos is an important field in marine biology.