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

There are many different specialty stores in this town.

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

She is planning a date with her current boyfriend.

This compound crystallises when cooled.

Through this chemical reaction, the substance crystallises.

He lost everything.

The shape of this crystal lattice is very unique.

This salt contains water of crystallization.

My boyfriend gave me a gift.