如果因攻击或特殊威能而引发机会攻击，那么就应先进行机会攻击。
If using an attack or special power provokes an opportunity attack, resolve the opportunity attack first.
黑客可能只需要小小的机会就对系统进行攻击并且引起永久性的损害。
An attacker may only need the slightest opportunity to wreak havoc on a system and cause permanent damage.
进行系统加固应该采取的首要步骤之一是降低其受攻击面：机器上运行的代码越多，代码被利用的机会更越大。
One of the first steps you should take when hardening a machine is to reduce its attack surface. The more code that's running on a machine, the greater the chance that the code will be exploitable.
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