Sound Engineer<br>Tom was a sound engineer. And it was his first day of work. He had to set up speakers for a night club. But they constantly made harsh screeching noises. After everyone left the nightclub in anger, Tom was fired.
Tom has been working as a sound engineer for years.
We can't tell for how long he has been a sound engineer from the context. System thinks it is just one day but that may or may not be the case.