| 释义 |
penumbra/piˈnʌmbrə/n. (pl. penumbrae /-bri:/ or penumbras) 1a the partly shaded outer region of the shadow cast by an opaque object, esp. (Astron.) that of the shadow cast by the earth or moon over an area experiencing a partial eclipse (尤指天文学中日蚀、月蚀的)半影 b Astron. the less dark outer part of a sunspot 【天】(太阳黑子周围的)半暗部 2a a partial shadow 半阴影 b an area of obscurity or uncertainty (界限模糊不确定的)区域 □ penumbral adj.[modern Latin, from Latin paene ‘almost’ + UMBRA ‘shadow’] |