????小心黑客！随着科技的进步，人们可能认为网络安全性也在与日俱增。不过事实并非如此。如果历史有什么值得借鉴的地方，那就是被黑客袭击（甚至反复袭击）总是难以避免。光是上个星期，就有两家公司不幸中招：先是俄罗斯黑客在网上公布了600万名商务社交网站LinkedIn用户的密码，然后eHarmony也遭到了手法类似的网络袭击，很有可能是同一拨人所为。现在，我们就来回顾一下过去十年里最严重的几起网络安全事件。

????Beware the hacker. As technology evolves, one would think security is keeping up. Not exactly. If history is anything to go by, getting hacked -- sometimes more than once -- is inevitable. In the last week alone, two tech companies came under fire when Russian hackers reportedly published 6 million LinkedIn user passwords; eHarmony experienced a similar cyber attack, possibly by the same group. Here's a look at some of the biggest security breaches over the last 10 years.