FDO代表功能设备对象。

FDO stands for function device object.

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如果设备只执行简单的密码功能，则所有对象必须由软件来管理。

If the device only performs a simple cryptographic function, all of the objects must be managed by the software.

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团队无法确定的字段或对象常常对于了解给定设备的功能很关键。

The fields or objects that the team was uncertain about were often central to the function of a given device.

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