Just to the left of the base of the pile, the snow on the ground becomes very light where the reflected light is added to the directillumination from the sun.
就比如这个雪堆的左方基部，不仅有来自太阳的直射光，还加入了地面的反光，所以显得特别亮。
2
But the recent onset of spring in the northern hemisphere and the beginning of directillumination by the sun have allowed scientists to begin the hunt for specular reflections.
但是，最近出现在春季北半球的太阳直接照射开始允许科学家们开始为镜面反射追捕。
3
So if some of the skin is in shadow, and some is receiving directillumination, it is quite possible to have a light beam enter through a lit area and leave through a Shadowed area.