Please make the changes only if no-one has modified the record since I read it.
请仅在从我读取该记录后没有人进行修改的情况下进行更改。
2
Message integrity and privacy: a mechanism to ensure that messages cannot be read or modified by third parties during transmission, and that it is actually coming from the requester.
消息完整性和私密性：这种机制确保在传输期间第三方无法读取或修改消息，它实际上来自请求者。
3
Execution of an operation will typically cause one or more persistent data records to be read, written, or modified.