unavailableadj.
英 ʌnə'veɪləb(ə)l | 美 'ʌnə'veləbl
中文adj. 难以获得的；不能利用的；不近便的
词根词源
unavailable (adj.)1540s, "ineffectual," from un- (1) "not" + available. Meaning "incapable of being used" is recorded from 1855. Unavailing has taken up the older sense of the word.
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