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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
本会議において重要な決議が採択された。
An important resolution was adopted at the plenary session.
現代社会に於いて様々な問題がある。
There are various issues in modern society.
今をおいてチャンスはありません。
There is no chance other than now.