He went to bed early because he was tired.

He decided to become a doctor.

He is always learning new skills to avoid becoming a desk worker.

He is of Han Chinese descent.

He is from the Hui people, a minority ethnic group in China.

The police are closely monitoring the activities of the motorcycle gang.

Aromatic compounds are a group of compounds with specific chemical properties.

He is studying the major ethnic groups in that region.

The culture of the Zhuang people is very unique, and their traditions and customs have a deep history.

The Indo-European languages are some of the most widely spoken in the world.