Police dogs are very effective in tracking criminals.

I went to the police station yesterday.

The head of the police station explained the details of the incident to the press.

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.

He is from an illustrious family.

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.