He was charged with breaking into several computer systems over the last year.

去年他被指控非法闯入几家电脑系统。

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He was charged with breaking into several computer systems over the last year.

他被指控去年侵入几个电脑系统。

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He was charged with breaking into several computer systems over the last year.

他被指控在过去一年中闯入数个电脑系统。

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Attackers can still conceal their point of origin by looping or leap-frogging several computer systems in several countries before finally going into the system that is being attacked as well as those pursuing them.

CENTERFORSECURITYPOLICY: The silent cyberwar

Media outlets including The New York Times, The Wall Street Journal and The Washington Post have all said this year that their computer systems were breached, while several NBC websites were briefly hacked in November.

NPR: Burger King Apologizes After Twitter Hacking

However, classified computer systems were compromised in the past using several methods.

CENTERFORSECURITYPOLICY: Center For Security Policy