They also said that eliminating the malicious computer code from compromised computer networks will be highly complex and challenging.

他们还说，从被攻破的计算机网络中消除恶意计算机代码将是非常复杂和具有挑战性的。

A botnet is a network of robots or compromised computers.

僵尸网络是机器人或受感染计算机的网络。

Even governments sometimes buy exploits, which allow them to compromise computers for purposes like spying.

甚至政府有时也会购买漏洞利用程序，这使他们能够出于间谍等目的破坏计算机。