perimeters
n. 周邊( perimeter的名詞複數 ); 周圍; 邊緣; 周長
The perimeter of an area of land is the whole of its outer edge or boundary.
...the perimeter of the airport...
機場四周
Officers dressed in riot gear are surrounding the perimeter fence.
身穿防暴服的警察正在包圍外圍的柵欄。
Examples include outdoor perimeters , traffic monitoring, tunnels, and car parks.
例子像戶外圍牆; 交通監視; 隧道和停車場.