inefficacyn.
英 ɪn'efɪkəsɪ | 美
中文n. 无效；无效力
词根词源
inefficacy (n.)"want of force or virtue to produce the desired effect," 1610s, from Late Latin inefficacia, from inefficacem (nominative inefficax), from in- "not, opposite of" (see in- (1)) + efficax (see efficacy).
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