构建一个具有防护来自自身攻击能力的内核很困难，并且通常这会对性能产生很大的负面影响。

Building a kernel that is capable of protecting against itself is difficult, and usually has a large negative impact on performance.

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我不是海军专家，但显然海盗几乎不可能不在暴露自身的情况下攻击船只。

I am no naval expert, but obviously the pirates can hardly attack a ship without revealing themselves.

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如今，连救护车自身也遭到攻击，因为匪徒们试图阻止救护车挽救敌人的生命。

Now ambulances themselves are coming under fire, as gangsters try to stop them saving the lives of their enemies.

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