To the Kronians it was simply a natural expression of what being human meant.

As such, it is a natural and full expression of our humanity.

Instead, he walked to his death with a natural, depressed facial expression.

People believe that behaviour is best left to natural, spontaneous expression.

Nor was I smirking; this is simply my natural expression.

Some may say that it is a natural expression of feeling.

His face settled into the scowl that seemed its natural expression.

Has three-dimensional art become the natural expression of the capital?

Most of the officers were there: not one had a wholly natural expression on his face.

This means that natural emotional expression must also be folded into the design.