formal notice的用法和樣例：
例句
- Changing classes without formal approval will be deemed withdrawal from a course without formal notification.
在任何情況下，私自者轉班者將當退讀課程論，并不會(huì )有正式通知。 - Any State which makes a declaration under this Convention may withdraw it at any time by a formal notification in writing addressed to the depositary.
根據本公約規定做出聲明的任何國家可以隨時(shí)用書(shū)面正式通知保管人撤回該項聲明。
