1. 名詞
   penumbra複數: (天文學日食、月食等的)半影
   (黑影周圍的)半陰影
   (太陽黑子周圍的)半暗部
   (繪畫等的)濃淡相交處
   (兩個相互排斥狀態等之間的)界限不明的部分
   /此名詞同"penumbras"/
   

   同義字詞
   dusk,shade,shadiness,shadow,umbra
   

例句

1. PENUMBRAE
2. In some English-language papers spots without penumbrae are considered pores .
3. These Penumbrae are the starting points of the Four Worlds, the four aspects of the terrestrial Umbra.
4. Yet although the Sun's magnetic polarity has reversed and the new solar cycle has been detected, most of the new cycle's spots have been tiny "pores" without penumbrae (see Figure 1); in fact, nearly all of these features are seen only on flux magnetograms and are difficult to detect on whitelight images.