perimeter
n. 外缘，周边；周长；（篮球）外围；视野计
复数 perimeters
例句
The plane veered off the runway and crashed through the perimeter fence.
这架飞机突然偏离了跑道并且冲断了周边的护栏。
《柯林斯英汉双解大词典》
They ended up ripping down perimeter fencing and tussling with the security staff.
他们最终扯掉了周边的栅栏，并和保安人员扭打起来。
A fence marked the perimeter of the field.
一道篱笆标明了那块田地的周界。
《新英汉大辞典》
