の分野で

in the field of

→ の
phrase Rare #42,198
in the field of Used to specify an area, field, or domain in which something happens. The particle で marks the setting or area of activity.
JA: 環境科学の分野で働きたいです。
EN: She wants to work in the field of environmental science.

医療の分野で働きたいです

I want to work in the medical field.

日本いくつかの分野でアメリカに追いついた

Japan caught up with the United States in several fields.

彼は生物学の分野で研究している

He conducts research in the field of biology.