He has a weary character.

My father is spreading phosphate fertiliser in the field.

He reported on the results of the subcritical nuclear experiment.

He performed a circus act on a unicycle.

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

Quinoxaline is one of the important compounds in organic chemistry.

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

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

I went to watch a curling match.

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