马怀龙是山东省青岛市公安局市北分局兴隆路派出所社区民警，转业从警17年来，除了守护一方平安，他还长期照顾这49把钥匙对应的49户孤残困难家庭。钥匙上没有编号和姓名，但每到一户人家，老马总能准确抓出对应的那一把。
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"We've had over 150 different children in our home. We've adopted three. So, doing that over those years, we have a lot of children in our home that were [previously] abused," he said.，推荐阅读Line官方版本下载获取更多信息
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