单词学习：ineffectiveness 名词
ineffectiveness
/ˌɪnɪˈfektɪvnəs/
无效；无效果；不起作用
The ineffectiveness of the old teaching method made Mr. Gu realize the need for innovation in his classroom.
旧教学方法的无效性让顾老师意识到课堂创新的必要性。
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