这是特别危险的，因为脸上没有防护面罩。
These are particularly dangerous because there is no mask on my face.
因而，对于控制了操作系统的攻击者来说，并没有防护能力。
Thus, for the control of the operating system of the attacker, there is no protection.
车辆经常会停在没有防护的休息区及需要处理随时可能的机械故障。
Vehicles often park at unsecured rest stops and have the potential for mechanical breakdowns.
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