She is conducting research on the world's oldest profession.

I have been to Reykjavík.

Women are smitten with his cool voice.

He participated in many intercultural activities to overcome his xenophobia.

His business is growing with unstoppable force and vigor.

I am interested in Japanese language education.

He took out a book from the bookshelf at the back of the room.

I have started learning Traditional Chinese.

I am learning Simplified Chinese.

The 16-cell is one of the convex regular polytopes in four dimensions.