如果它们包含机密信息，比如口令，您可能希望让服务器代理在读取文档之后删除该信息。
If they contain confidential information, such as passwords, you may want to have the server agent erase that information after it's been read.
非地址信息可被导入到便携式通信设备中的本地日程表，并且可以在使用后删除该信息以免占用本地日程表。
The non-address information may be imported to a local calendar in the portable communication device, and after use the information may be deleted to avoid polluting the local calendar.
该元数据存储了关于创建、版本和删除项的信息。
This metadata stores information about the creation, versioning, and deletion of items.
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