Sunlight fades and brightens as the thicker (opacus) and thinner (translucidus) portions of this icy cloud move rapidly from the southwest.
云层较薄的部分（半透明云）属于冰态云系，快速地从西南方移动
来。
Sunlight fades and brightens as the thicker (opacus) and thinner (translucidus) portions of this icy cloud move rapidly from the southwest.
云层较薄的部分（半透明云）属于冰态云系，快速地从西南方移动来。
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