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in perpetuity
固定短语，意为“永久地”，多用于法律、合同等正式文体，作状语。
The land was donated to the city in perpetuity.
这块土地被永久捐赠给该市。
永久；永恒
先理解核心含义，再看它在真实句子里的用法。
永久；永恒
the state of lasting forever or for an indefinitely long time; permanence
The land was donated to the city in perpetuity.
这块土地被永久捐赠给该市。
永恒的状态或性质；无限延续；不间断的存在。
The quality or state of being perpetual; endless duration; uninterrupted existence.
永恒的事物。
Something that is perpetual.
意在不可变更且无限期存续的限制；旨在使财产在一般法律确定或视为确定的界限之外不可转让的财产处置。
A limitation intended to be unalterable and of indefinite duration; a disposition of property which attempts to make it inalienable beyond certain limits fixed or conceived as being fixed by the general law.
定期付款从固定日期开始并无限期持续的年金。
An annuity in which the periodic payments begin on a fixed date and continue indefinitely.
The library will keep the rare manuscript in perpetuity.
这家图书馆将永久保存这份珍贵的手稿。
The family hoped for the perpetuity of their small farm.
这家人希望他们的小农场能够永续存在。
The grant guarantees perpetuity for the community's art program.
这笔拨款保障了社区艺术项目的永久延续。
固定短语，意为“永久地”，多用于法律、合同等正式文体，作状语。
The land was donated to the city in perpetuity.
这块土地被永久捐赠给该市。
可数名词，指无限期支付利息或年金的金融工具，如永续债券。
The foundation bought a perpetuity to fund its annual prize.
该基金会购买了一份永续年金，为其年度奖项提供资金。
Not this
The land was protected in perpetual.
Use this
The land was protected in perpetuity.
perpetual 是形容词，不能直接放在介词 in 后；表示“永久地”应使用固定短语 in perpetuity（名词），意为“永远、永久地”。
Not this
They wanted the peace to last for perpetuality.
Use this
They wanted the peace to last in perpetuity.
perpetuality 不是英语单词，不要凭 eternity 之类的词类推；正确名词是 perpetuity，固定搭配用 in perpetuity（永远）。
Not this
The company's rights were extended for perpetuities.
Use this
The company's rights were extended in perpetuity.
表示“永久”的 perpetuity 是不可数名词，不能用复数；perpetuities 只能指法律/金融上的“永久年金”。这里应用单数并说 in perpetuity。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
永久地；永远
The land was given to the city in perpetuity.
这块土地被永久地赠予了这座城市。
永远持续下去
The payments will continue in perpetuity.
这些付款将永远持续下去。
永久保护……
The organization seeks to preserve the monument in perpetuity.
该组织力求永久保护这座纪念碑。
永续债券
A perpetuity bond pays interest forever and never matures.
永续债券永远支付利息，从不到期。
永久地；永远地
The trust fund will pay for the scholarship in perpetuity.
该信托基金将永久为这项奖学金提供资金。
Use perpetuity naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
perpetuity 与 perpetual（永久的）形近，想象一条永无止境的河流，记住它表示“永久、永恒”。
语域：formal 常见场景：法律/合同文本、正式书面语 perpetuity 通常用于法律、合同或正式书面语中，表示永久、永恒的状态，日常口语中较少使用。
表示'永久'这一抽象概念时通常不可数；在金融或法律中指'永续年金'等具体事物时可数。常见固定搭配 in perpetuity 意为'永久地'。
Dictionary facts from ECDICT, WIKTIONARY.