facultative

英['fækəltətɪv] 美['fækəlˌteɪtɪv]
  • adj.能力的;偶发的;任意的;许可的;[生]兼性寄生的
  • obligate v.使负义务;强制;预留adj.有义务的;必要的;【医】专性的,固性的
  • parasitism n.寄生状态;寄生病
Adjective:
  1. of or relating to the mental faculties

  2. able to exist under more than one set of conditions;

    "a facultative parasite can exist as a parasite or a saprophyte"

  3. granting a privilege or permission or power to do or not do something;

    "a facultative enactment"

  4. not compulsory;

    "facultative courses in the sciences"

    1. The last questions in the examination were facultative.
      最後的那些考题答兴不答可听自便。

【邻近词汇】