After the rain when it is sunny again, layers of clouds make the sky look very beautiful.
雨过天晴，层层云锦把天空点缀得很美丽。
Kelvin-Helmholtz wave clouds are formed when there are two layers of air moving at different speeds and in opposite directions.
当两层空气以不同的速度、相对的方向移动时，便形成了开尔文一亥姆霍兹浪状云(Kelvin - Helmholtz)。
This kind of halo can form by sunlight passing through ice crystals in thin layers of high clouds.
这种光晕是由于阳光穿过高空薄云蕴含的冰晶而形成的。
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