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一个来自美国佐治亚州亚特兰大市的14岁男孩今年早些时候失踪了，他的母亲用自己智能手机上的一款名为“家庭追踪系统”的程序来帮助找出他所在的方位。
When a 14-year-old boy from Atlanta, Georgia disappeared earlier this year, his mother turned to her smartphone for clues using an app called Family Tracker that helped track his location.
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