A professional tone of voice, they say, will usually render the best results.

Taking a deep breath, Peabody trained her voice to sharp, professional tones.

"I'm with a student," she said, the professional tone back in her voice.

But apart from this an increasingly professional tone can be detected in two other ways.

"Forgive me, Captain," she said in her most professional tone.

"It's important that you and I maintain a professional tone, at least until the end of the trial."

One too easily acquires the professional tone and loses vision.

But suddenly a second voice called in, with a new and strictly professional tone.

In practiced, professional tones, the man began to tell a story.

Her harried, professional tone worked better than any curse or threat.