n.本影(影子中光源完全照射不到的部分)

原形：umbra复数：umbras

The umbra of the moon is visible during a lunar eclipse.
月球的暗影在月全食期间可见。
A solar eclipse occurs when the Earth's umbra falls on the moon.
日食发生时，地球的本影落在月球上。
The student observed the formation of an umbra during a science experiment.
学生在科学实验中观察了影子的形成。
The umbra in a room is where no direct light reaches.
房间里的本影区域是无直射光的地方。
The photographer adjusted her camera settings to capture the delicate details in the umbra.
摄影师调整了相机设置，以捕捉到阴影中的细微之处。
The artist painted a beautiful landscape, including the subtle gradations of light and shadow, including the umbra.
艺术家画了一幅美丽的风景画，包括光线和阴影的微妙渐变，包括本影部分。
In a tree's shade, there is an area of complete umbra where no sunlight penetrates.
在树荫下，有一个完全的本影区，没有阳光照射。
The umbra is a concept in mathematics, referring to the region where a function is zero.
在数学中，本影是一个概念，指的是函数为零的区域。
The architect designed the building with natural light in mind, minimizing the umbra created by interior structures.
建筑师在设计建筑时考虑到了自然光，尽量减少了内部结构造成的本影。
The term "umbra" is also used in computer graphics to describe the area of complete darkness in a 3D model.
在计算机图形学中，“umbra”也被用来描述三维模型中完全黑暗的区域。