perimeter

名词

1. 1

   周长数学

   Calculate the perimeter of a rectangle that measures six by four meters.

   请计算一个六公尺乘四公尺长方形的周长。

2. 2

   周围、外围、边界

   A tall fence runs along the perimeter of the school grounds.

   校园的外围架著一道高高的围篱。

3. 3

   防线、警戒线军事

   Guards patrol the perimeter of the base around the clock.

   警卫全天候巡守基地的防线。