But even compromising the unclassified networks, they still contain enormous amounts of sensitive information.

不过，虽说是非机密网络，但它们涵盖的敏感信息的量还是非常多的。

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。