umbra

n. 本影(影子中光源完全照射不到的部分) ^[1] 

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。

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。

A fringe region of partial shadow around an umbra.

邊緣地區的部分陰影。 ^[1]