将该金属安全屏蔽接地。
我们称之为完全屏蔽。
请使用合适阻抗的同轴电缆，并完全屏蔽测试夹具，以防大信号的漏泄。
Use the appropriate impedance coax cables, and completely shield the test fixture to prevent leakage of high level signals.
最终用户的通信通过一个单一的用户界面（UI ）和最终用户是完全屏蔽从而对网络的选择。
End-users communicate via one single user interface (UI) and end-users are thereby completely shielded regarding network selection.
如果无法找到三同轴的真空接头，那么可以在绝缘的BNC连接处构建金属安全屏蔽(图4 - 18)。
If a triaxial vacuum feedthrough is unavailable, a metal safety shield should be built around the isolated BNC connection (Figure 4-18).
该方法实现简单，但存在缺陷：由于附加块信息不同于正常通信过程，恶意用户容易察觉通信具有密钥恢复功能，使用数据包过滤方法，就可以完全屏蔽密钥恢复功能。
The implementation is practical but with obvious disadvantage: the illegal user can easily notice the key recovery, and by data package filtering, the key recovery function can be screened.
该方法实现简单，但存在缺陷：由于附加块信息不同于正常通信过程，恶意用户容易察觉通信具有密钥恢复功能，使用数据包过滤方法，就可以完全屏蔽密钥恢复功能。
The implementation is practical but with obvious disadvantage: the illegal user can easily notice the key recovery, and by data package filtering, the key recovery function can be screened.
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