彼の研究は広範囲に及んでいる。の英語

His studies cover a wide field.

His study covers a wide area.

His study ranges over a wide field―ranges wide―covers much ground―His study is of wide range.

His study is of great extent

His study extends over a wide range.

His inventions cover a wide field.

This research crosses a wide range.

almost through with his studies

His research bore fruit in the end.

He expanded his research.

His research ranks with the best of the kind.

He's getting on with his studies.

He narrowed his research area.

He expanded his research.

His inquiry extends through every portion of his profession.

His research is truly wonderful, don't you think?

That is going beyond the scope of training for this time.

He dedicate himself to research.

He dedicates himself to research.

He rates that research highly.

He is preoccupied with his studies.

His studies range over several languages.

His study absorbs him.

His study is based on what is called fact.

He concentrated his energies on studying.

He is deep in study.

His research is advancing apace.

My study is of small extent―confined within a narrow compass―confined within narrow limits―confined within narrow bounds.

he is going no farther in his studies

His research will come under review.