Knowing first-aid can be helpful in emergency situations.

Knowing first aid can save lives in emergency situations.

Legal aid provides financial assistance for people who cannot afford legal representation.

She uses a deaf-aid to help her hear better.

Foreign aid plays a crucial role in supporting the development of underdeveloped countries.

The government provides grant-in-aid to individuals and organizations for educational purposes.

The general's aide-de-camp accompanied him to the meeting.