periphery
/pəˈrɪfərɪ/noun
(pl. -ies)
1- the outer limits or edge of an area or object外围, 边缘：
new buildings on the periphery of the hospital site.
医院外围的新建筑。
1.1
- a marginal or secondary position in, or part or aspect of, a group, subject, or sphere of activity次要部分（或职位、方面）, 无关紧要的职位（或部分、方面）：
a shift in power from the centre to the periphery.
权力从中心到边缘的转移。
词源
late 16th cent. (denoting a line that forms the boundary of something)： via late Latin from Greek periphereia 'circumference', from peripherēs 'revolving around', from peri- 'around' + pherein 'to bear'.