名词
中文翻译：体力不足
同义词：
['weakness', 'fatigue', 'lack of strength']
例句：
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1. He was so tired that he couldn't finish the marathon.
他太累了，以至于无法完成马拉松。
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2. After a long day at work, she felt physically and mentally exhausted.
工作了一整天之后，她感到身体和精神都极度疲惫。
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3. The old man had been physically weak for years due to poor diet.
这位老人由于饮食不佳多年来一直身体虚弱。