This is a lighter area between the umbra and the edge of a shadow.
这是本影和阴影边缘之间较亮的区域.
辞典例句
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时, 在该区域的人才能够观测到日食.
期刊摘选
This includes the continuous survey of umbra and penumbra of the sunspot.
这包括对太阳黑子本影和半影持续的观测.
辞典例句