一个可能的原因是臭氧耗竭或云层高度改变引起紫外线辐射增强。
A likely candidate is rising ultraviolet radiation as a result of either ozone depletion, or a change in the level of cloud cover.
图像的宽度和高度改变了，即使只是一个象素，对于小象素大小字形区别都很大。
The image's width and height are altered. Even if this is only by one pixel , it can make a big difference at small pixel sizes.
当声波在温度随高度改变的空气中传播时，便会发生折射现象，声波会向著气温较低的地方走。
When sound wave propagates in air whose temperature changes with altitude, refraction of air happens. Sound will move towards areas with lower temperatures.
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