形容词
中文翻译：弱的
同义词：
['frail', 'feeble', 'feeble-minded', 'feeble-spirited']
例句：
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1. The old man is weak from lack of exercise.
老人由于缺乏锻炼而身体虚弱。
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2. The baby is too weak to walk yet.
这个婴儿还太小，还不能走路。
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3. The child was weak and could barely stand up.
那个孩子很虚弱，几乎站不起来。