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 direct illumination 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。

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But the recent onset of spring in the northern hemisphere and the beginning of direct illumination 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。

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So if some of the skin is in shadow, and some is receiving direct illumination, it is quite possible to have a light beam enter through a lit area and leave through a Shadowed area.

如果有的皮肤是影子，有些是直接接受光照、其实很有可能已经进入了一个明亮光束透过阴影区面积和休假。

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Spotlights have also been installed in the sides, floor and roof compartment so direct and indirect illumination makes His Holiness more visible when darkness falls.

CNN: Holy rollers: Popemobiles from trucks to limos

The small size of the LED light chip allows another advantage arising from the physics of optics: Engineers can employ collaterally small lenses making it possible to efficiently extract, direct and focus the lumens, achieving useful illumination with far fewer lumens--and far less energy--wasted.

FORBES: The LED Illumination Revolution