He chose suicide.

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.

The Winter Triangle is a shape that connects the brightest stars in the night sky.

Mahayana Buddhism is a sect of Buddhism that emphasizes compassion and universal salvation.

The Summer Triangle is shining in the night sky.