penumbra
n 半影(pen接近+umbra→接近影子的状态→半影)
释义2:
penumbra
/ pI5nQmbrE /
◙ (pl. penumbrae -briː或penumbras)1. the partially shaded outer region of the shadow cast by an opaque object• (不透明物体投射的)阴影的外围半阴暗部分 [Astronomy] the shadow cast by the earth or moon over an area experiencing a partial eclipse• [天文] (日食、月食的)半影 [Astronomy] the less dark outer part of a sunspot, surrounding the dark core• [天文] 半影(太阳黑子周围较淡的部分) any area of partial shade• 半阴影【派生】
♦ penumbral adjective【语源】
1. mid 17th cent.: modern Latin, from Latin paene 'almost' + umbra 'shadow'
俄语/英语字母转换