名词
中文翻译：无能的人
同义词：
['unable', 'powerless', 'incapable']
例句：
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1. The teacher was unable to explain the complex problem clearly.
老师无法清晰地解释这个复杂的问题。
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2. The injured soldier was powerless against the enemy's attack.
受伤的士兵无力抵抗敌人的攻击。
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3. The child was incapable of understanding the lesson at first.
孩子一开始无法理解这堂课的内容。