Penumbra Pen ;Umbr; A N 物理]半影；（绘画）浓淡相交处

This flashcard defines 'penumbra,' a noun referring to the partially shaded outer region of the shadow cast by an opaque object.

此闪卡定义了penumbra，名词，意为物理中的半影或绘画中的浓淡相交处。

Front	penumbra [pen-;umbr;-a n.]
Back	n. [物理]半影；（绘画）浓淡相交处

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