删除或丢失。例如，丢失位，丢失有效数字。
To delete or miss out; for example, drop bits, drop significant digits.
如果丢失的私钥只是用于数字签名文档，那么就可以生成一个新的密钥，而不会影响对已经签名的文档的有效性。
If the private key that's lost is only used for digitally signing the documents, a new key may be generated without affecting the validity of the existing signed documents.
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