invalidate
verb [ T ] uk/ɪnˈvæl.ɪ.deɪt/ us/ɪnˈvæl.ə.deɪt/
使无效；使作废
to officially stop a document, ticket, law, etc. being legally or officially acceptable
证明（观点、论点等）错误
to prove that an opinion, argument, etc. is wrong
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