依此法顺延

shall thereafter be renewable accordingly
本条约自互换批准书之日起生效，有效期…年；如在期满前一年，缔约任何一方未用书面通知另一方终止本条约，则本条约的有效期将自动延长…年，并～。The present Treaty shall come into force on the date of exchange of the instruments of ratification and shall remain in force for a period of… years. Unless either of the Contracting Parties gives to the other notice in writing to terminate the present Treaty one year before the expiration of this period,the present Treaty shall be automatically prolonged for another period of…years,and shall thereafter be renewable accordingly.