7月31号下午，涿州西北部的百尺竿镇下发通知，要求转移。孟伟是转移大军中的一员，当天下午，他自驾到市区，“基本上是踏着车底、加着油门过来的“。出发的时候，水位离他家的房子还有大约2米，到1号下午，基本上房顶都看不到了。

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