He underwent a bone marrow transplant surgery.

He plays a central role in this project.

He is a fervent communist.

This phenomenon occurs cyclically.

He has an introverted personality and struggles to speak in public.

This ship is equipped with a new capstan.

In film shooting, the clapperboard plays an important role.

This report provides a comprehensive analysis of the problem.

The shape of her cheekbones is beautiful.

In this chemical experiment, accurate dilution is necessary.