He is a successful industrialist who has started many companies.

He is our class representative.

This rock contains sanidine.

He is an expert in tidology, conducting research on ocean tides.

He is majoring in tidal science.

He is an expert in harmonic analysis.

His dream is to write a full-length novel.

He sat in front of the computer for a long time.

We conducted a detailed investigation into the issue.

The music was within audible range.