As hackers turned up, layers of security, from antivirus programs to firewalls, were added to try to keep them at bay.
随着黑客的出现，从防病毒程序到防火墙的层层安全措施被添加进来，试图阻止他们。
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They could be the firewalls of any building.
它们可能是任何一座楼房的隔火墙。
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