a region of complete shadow resulting from total obstruction of light
例句
用作名词 (n.)
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。
It is the custom that aged or infirm Striders make a final journey into the Umbra, never to return. 年老或者衰弱的漫游者会根据传统最后一次出发去影界，一去不归。
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。
Shaped like a cone extending into space, the umbra has a circular cross section that can be most easily seen during a lunar eclipse. 本影就像一个圆锥一样延伸在空间中，当月食发生时，它很容易被看到。
美
['ʌmbrə]
