The rise and fall of the Roman Empire is a part of history.

In China, a strict birth control policy was implemented at one time.

The manufacturing industry occupies an important part of the economy.

This beautiful cordierite is a part of my gemstone collection.

Scientists are warning that this substance has carcinogenicity.

We are heading in the northwest direction.

She decided to have plastic surgery to gain confidence.

My mother was surprised when she saw my report card.

He publicly admitted that he is a bisexual.

The sinusoid is used to represent many phenomena in nature.