pe·rim·e·ter /pəˈrɪmətɚ/
  周長,周界
  pe·rim·e·ter /pəˈrɪmətɚ/ 名詞
  周,周邊,視野計
  Per·im·e·ter n.
  1. Geom. The outer boundary of a body or figure, or the sum of all the sides.
  2. An instrument for determining the extent and shape of the field of vision.
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  perimeter
       n 1: the boundary line or the area immediately inside the
            boundary [syn: margin, border]
       2: a line enclosing a plane areas
       3: the size of something as given by the distance around it
          [syn: circumference]