[气象]卷积云
a high cloud of ice crystals grouped into small separate globular masses, usually occurring above 6000 metres (20 000 feet)See mackerel sky
1. a cloud at a high altitude consisting of a series of regularly arranged small clouds resembling ripples
(synonym)
(hypernym)
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1. a cloud at a high altitude consisting of a series of regularly arranged small clouds resembling ripples(synonym) (hypernym) 
简明英汉词典
柯林斯
百科