It would be particularly useful to specify the characteristics of the customary rule on the interpretation of treaties which was codified in article 31, paragraph 3 (a) and (b), of the 1969 Vienna Convention.
具体规定条约解释惯例的特点尤其有用，这些惯例已在1969年《维也纳公约》第三十一条第三款(甲)和(乙)项中加以编纂。