4. Any State that makes a declaration under this Convention may modify or withdraw it at any time by a formal notification in writing addressed to the depositary. The modification or withdrawal is to take effect on the first day of the month following the expiration of six months after the date of the receipt of the notification by the depositary.
四、根据本公约的规定作出声明的任何国家，可以在任何时候以书面形式正式通知保存人更改或撤回该项声明。此种更改或撤回于保存人收到通知之日起满六个月后的下一个月第一日生效。