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.

The study of crystal classes is an important part of mineralogy.

The Qiang people are one of the ethnic minorities in China.

Aliphatic compounds are organic compounds in which carbon atoms form straight or branched chains.

He goes to the company every day as a company man.

He comes from the declining aristocracy, a lifestyle that is not seen today.