This is a lighter area between the umbra and the edge of a shadow.
這是本影和陰影邊緣之間較亮的區域.
辭典例句
Only moon umbra totally puts on earth, the shadow area can watch the eclipse.
唯有在月球的本影投影在地球表面時, 在該區域的人才能夠觀測到日食.
期刊摘選
This includes the continuous survey of umbra and penumbra of the sunspot.
這包括對太陽黑子本影和半影持續的觀測.
辭典例句