cirrostratus
noun [ U ] environment specialized uk/ˌsɪr.əʊˈstrɑː.təs/ us/ˌsɪr.oʊˈstreɪ.t̬əs/
卷层云(一种薄雾状白色高空云)
a type of flat, whitish cloud formed in a very thin layer and seen high in the sky
Compare: altostratusnimbostratus
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