Facing a desperate situation, he chose to commit suicide.

He made a self-oath to achieve his goals.

He took an oath to himself to succeed.

This hermit crab can perform autotomy when it senses danger, allowing it to escape from enemies.

This self-propelled lawnmower is very convenient.

She takes good care of her natural nails and never neglects them.

In psychology, it is important to understand the mechanism behind human behavior.

We adopted the AA system to start a new project.

Monarchy still exists in some countries.

Bureaucracy plays an important role in the operation of the government.