单词学习：ineffectualness 名词
ineffectualness
/ˌɪnɪˈfektʃuəlnəs/
无效；徒劳无益；不起作用
The ineffectualness of the old teaching method was evident when 顾老师 introduced interactive activities and saw immediate improvement in student engagement.
当顾老师引入互动活动并看到学生参与度立即提升时，旧教学方法的无效性就显而易见了。
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