形容词
中文翻译：虚弱的
同义词：
['frail', 'feeble', 'feeble-minded']
例句：
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1. The old man is weak and needs to rest more often.
老人虚弱，需要经常休息。
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2. The baby is too weak to walk yet.
宝宝太弱了，还不能走路。
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3. The scientist's theory was weak because it lacked empirical evidence.
科学家的理论因缺乏实证证据而显得薄弱。