facultative
a. 授权的, 机能上的, 才能上的, 能力上的, 兼性的, 可选择的, 任意的 [化] 兼性的
发音
UK
/ˈfæ.kəl.tə.tɪv/
US
/ˈfæ.kəlˌteɪ.tɪv/
词形变化
more facultative
比较级
most facultative
最高级
释义与例句
adj.
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1.
Of or relating to faculty, especially to mental faculty.
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2.
Not obligate; optional, discretionary or elective.
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3.
That grants permission or power to do something.
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4.
Able to perform a particular life function, or to live generally, in more than one way.
生物facultative feeder
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5.
At which a given function is positive.
数学
词汇关系
词源
From French facultatif. By surface analysis, faculty + -ative.
来源：wiktionary