He remains calm even in difficult situations.

He is fighting on the front line.

The contours of her face are beautiful and artistic.

I could clearly see the outline of his face.

It is reported that North Korea has conducted another underground nuclear test.

Nuclear tests pose a great threat to world peace.

He holds the real power in the company.

We will conduct a new chemistry experiment tomorrow.

This project is still in the experimental stage.

He conducts research in the laboratory every day.