periphery [pəˈrɪfəri]

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n.(圆体的)外面；周围

the outer edge of an area

Geographically, the UK is on the periphery of Europe. 从地理位置上讲，英国处于欧洲边缘。
The periphery of the retina is very sensitive to motion. 视网膜的外围对运动非常敏感。