形容词
中文翻译：无效的
同义词：
['unfit', 'ineffective', 'unsuitable例句：1. The medicine is invalid for those who have a fever.（这种药对发烧的人无效。）']
例句：
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1. The medicine is invalid for those who have a fever.
这种药对发烧的人无效。
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2. The design of the building is invalid because it does not meet safety standards.
这座建筑的设计是无效的，因为它没有达到安全标准。
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3.The plan was invalidated by the court due to lack of legal authority.
由于缺乏法律授权，法院宣布该计划无效。