He is a specialist in that field.

He is an expert in pomology and is researching the cultivation methods of many fruits.

He reads a lot of books.

He spends a lot of time studying.

Please tell me the way to solve this problem.

He is an expert in pomology and is researching the cultivation methods of many fruits.

He is an expert in pomology and has contributed to the improvement of many fruit varieties.

This fruit is very rare, and it's hard to find.

I eat fresh fruit every day.

I am cultivating vegetables in my garden.