不透明物体所投阴影中完全阴暗的内部区域。
umbras — plural of umbra
不透明物体所投阴影中完全阴暗的内部区域。
The fully shaded inner region of a shadow cast by an opaque object.
完全遮挡光线而形成的阴影区域
a region of complete shadow resulting from total obstruction of light
太阳黑子的中心区域。
The central region of a sunspot.
泥鱼科(Umbridae)的鱼之一。
One of the family Umbridae of mudminnows.
石首鱼科(Sciaenidae)Umbrina属的鱼之一。
One of genus Umbrina of drums (family Sciaenidae).
影子微积分的一个元素。
An element of the umbral calculus.
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