Outlined by rays of sunlight known as crepuscular rays, they are actually shadows cast by clouds near the distant western horizon, the setting sun having disappeared from direct view behind them.
在被称为曙暮辉的太阳光线的照射下，它们实际上是由靠近遥远的西方地平线的云层产生的阴影，此时落日在云层的正后方渐渐隐去。
The thesis researches on the science of lights & shadows and the theory of "camera obscura" . It clarifies the influence from the science of lights & shadows to the western painting.
本文通过对光影的科学及视觉“暗箱”原理的考察，阐明光影科学与视觉原理对西方绘画的影响；通过透视法、明暗法这一线索考察西方绘画中的光影理论，明确光影是绘画的首要问题。
It is especially beautiful now, on this afternoon, with the shadows growing long down the western slopes, and the "leaves yellow on the cottonwoods;"
在这个傍晚，在此时此刻，它分外美丽，西边山坡上的阴影正在拉长，“三角叶杨的叶子已经变黄；
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