Bombs that targeted the Boston Marathon on Monday may have been packed in pressure cookers, investigators say.

　　针对波士顿马拉松赛星期一可能会被包装在压力锅的炸弹，调查人员说。

　　Images from a joint Homeland Security and FBI bulletin show the remains of a dark backpack, a detonation device and mangled pieces of metal.

　　从一个联合国土安全局和联邦调查局通报的图像显示的是黑暗的背包，一个爆炸装置和扭曲的金属碎片。

　　Three people were killed and more than 170 injured when two bombs exploded near the finish line of Monday's race.

　　三人死亡，170多人受伤，两枚炸弹爆炸在星期一的比赛终点线。

　　Those who died were an eight-year-old boy, a woman aged 29 and a postgraduate student from China.

　　人是一个八岁的男孩，一个女人和一个29岁的研究生来自中国。

　　The BBC's Paul Adams, in Boston, says vigils(守夜，监视) for the victims were held across the city on Tuesday night as Bostonians still wrestled with why anyone would want to attack their much-loved marathon.

　　英国广播公司的保罗亚当斯，在波士顿，说守夜(守夜，监视)为遇难者举行的市在星期二晚上仍然在波士顿人为什么会有人想要攻击他们的爱马拉松。

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