Chapter 9 Law of TreatiesMain Contents of Chapter IXSection One IntroductionSection Two The Conclusion of TreatiesSection Three ReservationsSection Four The Entry into Force and Provisional Application of TreatiesSection Five The Observation, Application and Interpretation of TreatiesSection Six The Invalidity, Termination and Suspension of Operation of TreatiesSection One Introduction一、条约作为当代国际法的最主要渊源二、条约法的编纂codification of the law of treaties 1969维也纳条约