形容词
中文翻译：虚弱的
同义词：
['frail', 'feeble', 'weak', 'feeble-minded']
例句：
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1. The old man was so weak that he couldn't walk very far.
老人非常虚弱，走不了多远。
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2. The baby is too weak to feed himself.
婴儿太弱了，无法自己喂食。
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3. The scientist discovered a new method to make the material stronger and more durable.
科学家发现了一种新的方法使材料更强更耐用。