云是由海洋中的水分被太阳加热蒸发而形成的，这些水分上升到大气中，凝结成微小的水滴，附着于微小的尘埃颗粒。
Clouds are formed from the evaporation of the oceans' water that is warmed by the Sun and rises high into the atmosphere, condensing in tiny droplets on minute particles of dust.
然后上升气流将轻盈的、带正电荷的冰晶带到云的顶部。
Then updraft wind currents carry the light, positively charged ice crystals up to the top of the cloud.
云层亮度上升趋势提示大气环境的微妙变化，而这也许和温室气体的变化有关”迪兰如是说。 极地中间层的云对大气中水汽和温度十分敏感。
Polar mesospheric clouds are extremely sensitive to changes in atmospheric water vapor and temperature.
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