に際さいして

expression

on the occasion of; at the time of; when

A formal expression used for an action or situation connected with a particular event, occasion, or important step. It commonly follows nouns, as in ご利用に際して, or dictionary-form verbs, as in 契約を結ぶに際して.

• ご利り用ように際さいしては、利り用よう規き約やくをお読よみください。

  When using the service, please read the terms of use.

• 契けい約やくを結むすぶに際さいして、いくつか確かく認にんしたい点てんがあります。

  When entering into the contract, there are a few points I would like to confirm.