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
部分（半透明云）属于冰态云系，快速地从西南方移动
来。
（蔽光云）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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