To "purport" means to claim to be or do something, often with doubt about the truth of the claim.
If you say that someone or something purports to do or be a particular thing, you mean that they claim to do or be that thing, although you may not always believe that claim.
[VERB 动词]声称;自称;标榜 If you say that someone or something purports to do or be a particular thing, you mean that they claim to do or be that thing, although you may not always believe that claim.
[V to-inf]
[FORMAL 正式]
...a book that purports to tell the whole truth.
声称要讲述全部事实的一本书
Oxford
pur·port
verb
,
noun
purportpurportspurportedpurportingverb/pəˈpɔːt; NAmEpərˈpɔːrt/purportto be/have sth ( formal) to claim to be sth or to have done sth, when this may not be true 自称;标榜SYN
profess
◆The book does not purport to be a complete history of the period.本书无意标榜为那个时期的全史。noun/ˈpɜːpɔːt; NAmEˈpɜːrpɔːrt/[singular ]the purportof sth ( formal) the general meaning of sth 主要意思;大意;主旨pur·port/pəˈpɔːt; NAmEpərˈpɔːrt/
formal to claim to be or do something, even if this is not truepurport to do something Two undercover officers purporting to be dealers infiltrated the gang.be purported to be something The document is purported to be 300 years old.—purportedly adverb: a portrait purportedly of Shakespeare