您要查找的是不是：
- efficiency n. 效率, 效能
- efficacy n. 功效，效力
- efficacious adj. (药、措施等)有效的
- effeminacy n. 柔弱,女人气,娇气
inefficacy n. 无效；无效力
网络短语:
inefficacy contract 无效合同
rupture inefficacy 断裂失效
market inefficacy 市场失效
taper inefficacy area 圆锥模糊区
probability of inefficacy 失效概率
efficacy and inefficacy 有效和无效
inefficacy in platelet transfusion 血小板输注无效
inefficacy in the evaluation 评判失效
the theory of relative inefficacy 相对无效说