peri-

例句：

1. 1.The perimeter of the park is 2 kilometers away from here.
   公园的周长是2公里。
2. 2.The company's headquarters are located in the periphery of the city.
   公司的总部位于城市的外围。
3. 3. The research focused on the periphery of the ocean.
   研究集中在海洋的边缘。