He performed a circus act on a unicycle.

We took a walk in the primeval forest over the weekend.

This simple forest is very important from the perspective of biodiversity.

Quinoxaline is one of the important compounds in organic chemistry.

I went to watch a curling match.

The shelterbelt in this area plays a role in protecting crops from strong winds.

The Hanlin Academy was one of the most important academic institutions in Chinese history.

He is interested in learning the techniques of cunnilingus.

In chemical experiments, we use a graduated cylinder to measure the exact amount of liquid.

Have you ever seen a helicopter hovering?