In order to incubate bird eggs, it is necessary to keep the temperature and humidity constant.

Bird eggs hatch at the appropriate temperature and humidity.

I can't go to college because the tuition is too high.

I have to pay my tuition by next month.

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.

He lost everything.

My boyfriend gave me a gift.