形容词
中文翻译：无效的
同义词：
['ineffective', 'inefficient', 'inadequate', 'incapable例句：1. The new policy is ineffective at solving the problem.（新政策在解决问题上是无效的。）']
例句：
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1. The new policy is ineffective at solving the problem.
新政策在解决问题上是无效的。
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2.The machine is ineffective at cleaning the floor.
这台机器在清洁地板上是无效的。
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3.The teacher's advice was ineffective in helping the student improve his grades.
老师的建议对学生提高成绩没有帮助。