The ash in the atmosphere caused weird optical effects too that made the moon occasionally appear blue or even green.

混入了大量灰尘的大气层产生了一种诡异的光学效应，使得月亮有时候看起来是蓝色的，甚至是绿色的。

The image produced by this new camera is absolutely beautiful, and the new portrait blur emulates the wide aperture optical effect of a professional DSLR camera.

这款新摄像头产生的图像绝对漂亮，新的人像虚化模拟了专业单反相机的大光圈光学效果。

This optical effect is called refraction, and it is greatest when the sun's on the horizon (and thus its light is passing through the greatest amount of air).

这种光学效应称为折射，当太阳位于地平线时（因此它的光穿过最大量的空气），这种光学效应最大。