facultative
['fækəltətiv]
adj. 授权的，特许的
反义词
参考例子
1.Are the conflict rules facultative or mandatory for the judge and the person concerned?
冲突法对法官和当事人是任意性规范还是具有强制性的拘束力？
2.There are two modes in the preceding process, which are facultative biochemical mode and biologic enhanced flocculation mode.
前处理单元在两个模式，即兼性生化模式与生物强化絮凝模式之间转换。
3.A facultative anaerobic bacillus strain ××—01 was isolated and selected from the cattle stomach which can produce exocellular cellulase.
从牛胃中分离筛选出一株兼性厌氧芽孢杆菌××—01，可产生分解纤维素的胞外酶。
英文解释
adj.
1.of or relating to the mental faculties
2.able to exist under more than one set of conditions
3.granting a privilege or permission or power to do or not do something
4.not compulsory
网络释义
facultative
兼生性; 兼性; 兼性因素; 兼性的;
facultative heterochromatin
兼性异染色质; 异染色质;
facultative saprophyte
兼性腐生菌; 兼腐生物（兼性寄生物）; 兼性死物寄生菌; 或兼性腐生物;
facultative insurance
临时保险; 临时保险。;
facultative bacteria
兼性细菌; 兼性细菌，适应性细菌; 二兼性细菌;