Indeed, border guards and their equipment can be equally effective without a physical barrier. At best, walls and fences only slow people down, making them a poor investment from a security standpoint.
事实上，边境看守和他们的设备在没有实体隔离障的情况下同样有效。高墙和藩篱充其量只能减缓人们越境的速度，这意味着从安全角度，建设边境墙是拙劣的投资。从军事角度，边境墙同样无效。导弹和飞机可以飞越它们，坦克可以碾过它们。