He proposed to her using a prop.

Propene plays an important role in organic chemistry.

Propyne plays an important role in organic chemistry.

I take a propolis supplement every day.

Provitamin is a substance that turns into a vitamin in the body.

Proline is one of the components of proteins.

He is working at this museum as an artist-in-residence.

Legislators have the responsibility to make laws.

Due to yesterday's heavy rain, the village was hit by a flash flood.

He was anxious about starting a new business, but I encouraged him by saying, 'Even a journey of a thousand miles begins with a single step.'