She said McKinnon's hacking activities "were not random experiments in computer hacking, but a deliberate effort to breach US defence systems at a critical time which caused well-documented damage.

她说，麦金农的黑客活动“并不是非法访问计算机时的随机试验，而是在关键时刻故意破坏美国防御系统，并且留下了证据确凿的损害。

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There are many random factors in air defence operation, thus. It is hard to forecast the result and select the operation project.

在防空兵对空战斗中存在大量的随机因素，因而战斗结局也不能准确预测，给作战方案的选择带来了困难。

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