pe·riph·ery /pəˈrɪf(ə)ri/
  外圍
  pe·riph·ery /pəˈrɪf(ə)rɪ/ 名詞
  Pe·riph·er·y n.; pl. Peripheries
  1. The outside or superficial portions of a body; the surface.
  2. Geom. The circumference of a circle, ellipse, or other figure.
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  periphery
       n : the outside boundary or surface of something [syn: fringe,
            outer boundary]