Perimeter
例子
The geometry student calculated the perimeter of the rectangular garden to determine how much fencing would be needed.
几何学生计算了矩形花园的周长，以确定需要多少围栏。
02
周边, 边缘
the margins at the outer edge of an area
例子
The wildfire fighters focused on containing the blaze within the perimeter to prevent it from spreading to residential areas.
消防队员专注于将火势控制在周边范围内，以防止其蔓延到居民区。
