The exosphere is the outermost layer of Earth's atmosphere.

He abstained from his voting rights in the election.

Because her immune system is weak, she catches a cold easily.

We acquired the easement of the neighboring land to build a new building.

He is dedicated to the study of the atmosphere.

Please avoid this road because it's dangerous.

He is studying computer science at a specialized school.

There are many different specialty stores in this town.

He is a specialist fool, with no interest in anything outside his field.

He couldn't say anything about issues outside of his field of expertise.