In downtown Vancouver, some roads are already closed, and rings of security fencing surround some key venues.
在温哥华市中心，一些道路已经封闭，一些关键场所周围围起了安全围栏。
Security fencing
原声例句
历年英语专业四级听力真题（含译文）
英语百科
Perimeter fence
（重定向自Security fencing）
A perimeter fence is a structure that circles the perimeter of an area to prevent access. These fences are frequently made out of single vertical metal bars connected at the top and bottom with a horizontal bar. They often have spikes or Barbed wire on the top to prevent climbing. Residential perimeter fences are normally made of wood about six inches thick, or a solid wall. Some fences may be string-like pieces of metal stretching across horizontally and vertically, creating a mesh of metal.
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