On January 20, 2004, researchers released a swarm of 66 pint-size robots into an empty office building at Fort A. P. Hill, a training center near Fredericksburg, Virginia.

二零零四年一月二十日，研究人员将一个共六十六个机器人群放入了一个位于Fort A. P. Hill空荡的写字楼，这是维吉尼亚州弗雷德里克斯堡附近的一个训练中心。

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A rescue worker stands on the grounds of the vast petrochemical complex in the port city of Skikda, January 20, 2004, following a huge explosion on the evening of January 19.

1月20日，一名救援人员站在斯基克达（阿尔及利亚一个省城）液化天然气提炼厂爆炸现场。

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