He took an oath to himself to succeed.

He started a new project, having stood ready and had his bow drawn.

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

He treats us as a big friend.

He is an expert in embryology, studying the developmental processes of many kinds of organisms.

The process of embryogenesis is very complex, with continuous cell division and differentiation.

There was a big earthquake yesterday.

He has confidence in his abilities.

He has confidence in his own abilities.

He is a person with strong self-control.