pre·scrip·tive /prɪˈskrɪptɪv/ adjectiveadj 1 MUSTsaying how something should or must be done, or what should be done 规定的,指定的 prescriptive teaching methods 规定的教学方法
3. prescriptive right British EnglishBrE law a right that has existed for so long that it is as effective as a law 依时效而取得的权利 —prescriptively adverbadv