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Attacks on Internet sites and infrastructure, and the compromise of secure information, pose a particularly tricky problem because it is usually impossible to trace an attack back to its instigator.

因为通常不可能追踪到攻击者，对互联网站和网络基础结构的攻击，及其对安全信息的危害，是一个异常棘手的问题。

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To help you tie these techniques back to the classes of attack just presented, for each technique we will include the following graphic.

为了帮助您将这些技术与刚才提到的攻击类别联系起来，我们将使用以下图形解释各种技术。

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Should Mexico attack, Taylor and his men were to strike back as hard as possible.

VOA: special.2009.02.19

So how would we go about solving this problem if I told you not only was there a maximum weight, but there was a maximum volume. Well, we want to go back and attack it exactly the way we attacked it the first time, which was write some mathematical formulas.

有些时候两个都重要,所以如果我告诉你这里不仅有,最大重量还有最大容量，我们应该怎么解决这个问题呢？,好了，我们想回过来然后,和第一次一样看看这个问题。

麻省理工公开课 - 计算机科学及编程导论课程节选

"We are afraid to return to the camp, because armed men may come back to attack us, " Fatima Adam Badaui, a woman from the Kassab camp, told UNAMID.

CNN: STORY HIGHLIGHTS

And he refused to back Israeli plans to attack Iran's nuclear installations.

CENTERFORSECURITYPOLICY: Exploiting the crisis

Essentially, when it detects an intruding piece of malware, the program follows the virtual trail left behind back to the attack's source -- disabling every machine it encounters along the way.

ENGADGET: Japan working on powerful cyber weapon, knows best defense is a good offense