Due to the fire, black smoke was billowing in the sky.

He is suffering now because of his past bad deeds.

The theory of black body radiation is an important part of physics.

After the fire, black smoke was hanging in the sky.

He is dark-skinned, suitable for working under the sun.

He used to be a member of the Chinese gang.

He likes to take a walk in the park at dusk.

This old tunnel was once used in a mine.

This old tunnel was once a key point of transportation.