Duncan suddenly realized he was holding his breath and let it out in a long exhalation.

She settled back in her seat with a slow, long exhalation.

I let out a long exhalation, looking at my feet.

She felt him relax a little, and heard his long exhalation.

He stopped breathing; at last let out his breath in a long exhalation.

This is followed by a long exhalation as the arms are pulled backwards.

She started, hearing the long, ragged exhalation of his breath.

I heard a match, then a long exhalation of breath.

He sucked air then let it out in a long exhalation.

The sound as he let out a long exhalation seemed very loud.