at (a time or place); in; on
in (a situation, matter, etc.); on (a point); when it comes to; regarding; with respect to; in (terms of); as to; as for
on the part of; under the authority of; in the name of
会議は東京において行われた。
The meeting was held in Tokyo.
この分野において彼は第一人者だ。
He is a leading figure in this field.
現代社会において重要な問題です。
It is an important issue in modern society.