形容词
中文翻译：虚弱的
同义词：
['weak', 'feeble', 'delicate', 'frailty']
例句：
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1. The old man was frail and could not walk very far.
老人身体虚弱，走不远。
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2. The baby is frail and needs extra care.
婴儿身体虚弱，需要额外的照顾。
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3. The fragile ecosystem of the rainforest is under threat.
雨林这个脆弱的生态系统正受到威胁。