事前 before the event; in advance; beforehand 事前毫无准备 with no preparation at all; 事前准备好 be prepared beforehand; 未来之事事前有预兆。 coming events cast their shadows before
Then based on the attack tree model , an attack specification language is consmicted and an example of ip - spoofing theck is given 另外,还使用攻击树来对系统安全事前分析,并提出了权重的计算算法。
The followng research objectives accomplish this intent " . an attack specification language based on enhanced attack tree model is constfucted 使用攻击树对系统安全进行事前分析,并提出了权重的计算算法。