On the arizona side of a vehicle barrier , border patrol agents have smoothed the sand with old tires so they can " cut sign " ? track the foot prints of migrants tempting fate on this remote desert route 在车障靠近亚利桑那州的这边，边境巡逻队用旧轮胎整平沙地，以便能够追踪非法移民企图穿越这片遥远沙漠留下的足迹。
