frail [freɪl]

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adj.身体虚弱的；易损坏的

weak or unhealthy , or easily damaged , broken or harmed

Mrs. Warner is already 96 and too frail to live by herself. 华纳太太已经九十六岁了，身体虚弱，不便独居。
She lay in bed looking particularly frail. 她躺在床上，看上去特别虚弱。