You will sometimes see barbed wire on the top of fences or walls around some very secure area – a military installation or some other area where the business wants to prevent people from getting into that area.

有时，您会在一些非常安全的区域（军事设施或企业希望阻止人们进入的其他区域）周围的围栏或墙壁顶部看到带刺铁丝网。