umbra的用法和样例：

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。

【近义词】

shade阴影

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