His horse ran as fast as a fast horse.

Xenon is a type of noble gas.

His recovery was truly a miracle.

Parasitism is a part of nature and a form of interaction between organisms.

The insect lives by parasitizing plants.

The government decided to restrict tobacco advertising.

In psychology, it is important to understand the mechanism behind human behavior.

This rare stone is something I found in the mountains.

This rock contains pyroxene.

I plan to go home this summer.