形容词中文翻译1
中文翻译：Unknown
同义词：
['feeble', 'frail', 'feeble-minded', 'feeble-spirited']
例句：
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1. The oldman is weak at the knees and can hardly walk.
老人膝盖软弱，几乎走不动。
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2. The baby was weak at the knees and couldn't hold up its head.
婴儿膝盖软弱，不能抬起头。
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3. The old woman was weak at the knees and had to sit down for a while.
老妇人膝盖软弱，不得不坐下来休息一会儿。