Changing classes without formal approval will be deemed withdrawal from a course without formal notification. 在任何情况下，私自者转班者将当退读课程论，并不会有正式通知。
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. 根据本公约规定做出声明的任何国家可以随时用书面正式通知保管人撤回该项声明。
