2009年，新闻报道称美国电网的控制系统被黑，且侵入者建立了秘密入口以便随时返回。
In 2009, this newspaper reported that the control systems for the U.S. electric power grid had been hacked and secret openings created so that the attacker could get back in with ease.
2009年，新闻报道称美国电网的控制系统被黑，且侵入者建立了秘密入口以便随时返回。
In 2009, this newspaper reported that the control systems for the U.S. electric power grid had been hacked and secret openings created so that the attacker could get back in with ease.
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