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perisphere
['pεriˌsfɪə, -ˌsfɪr]
n
gen.
正圆球
;
中心周球
;
重力磁场层
;
周氛
agric.
中心周球
(perisphera)
tech.
周层
;
球形建筑物
;
外围层
;
势力范围
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