This is not the crux of the issue, the protection system in the pump only after the failure of a remedy, is a relatively passive approach.
但这并不是问题的关键，保护系统只不过是在泵发生故障后的一种补救办法，是一种比较被动的办法。
A mass of practice prove that it is not enough to ensure the security of network system only depending on traditional passive protection.
大量的实践证明，保障网络系统的安全，仅仅依靠传统的被动防护是不够的。
But that is not the crux of the issue, the protection system at pump only after the failure of a remedy, is a relatively passive approach.
但这并不是问题的关键，保护系统只不过是在泵发生故障后的一种补救办法，是一种比较被动的办法。
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