遗失的约定英语怎么说

"Lost agreement" or "lost contract" is a term used in the legal field to refer to a written agreement or contract that cannot be found or produced, or that has been destroyed. This can be a problem when the parties to the agreement need to refer to it or enforce it, as they may not have a copy of the document or may not be able to prove that the agreement existed.
The concept of a lost agreement or contract is based on the idea that written agreements and contracts are important legal documents that should be kept and preserved for future reference. In many jurisdictions, there are legal requirements for the preservation of such documents, and failure to do so can result in legal consequences.
Here are some example sentences using the term "lost agreement" or "lost contract" in English, along with their translations in Chinese:
"The plaintiff claims that the defendant breached the lost contract by failing to deliver the goods as promised." (原告称被告未按照约定交付货物，违反了遗失的约定。)
"The court ruled that the lost agreement was not enforceable because there was no evidence of its existence." (法院裁定遗失的约定无效，因为没有证明其存在的证据。)
"The parties are trying to reconstruct the lost contract using emails and other documents as evidence." (双方正在尝试使用电子邮件和其他文件作为证据来重建遗失的约定。)