An invalid document, ticket, law, etc. is not legally or officially acceptable.(文件、票、法律等)无效的,不合法的,官方不承认的
An invalid opinion, argument, etc. is not correct, usually because it is not logical or not based on correct information.(观点、论点等)站不住脚的
someone who is sick and unable to take care of himself or herself, especially for a long time(常指需要他人长期照料的)病人
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