urgent mail的用法和樣例：
例句
- The school often uses e-mail to contact parents for urgent matters.
學校經常透過電子郵件跟家長與老師聯系緊急事件。 - While the bans typically allow emailing clients and customers or responding to urgent matters, the normal flow of routine internal email is halted.
一般來說，給客戶發電子郵件或用其處理緊急事務還是允許的，但公司內部的常規電郵暫時停止。
