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雲級 (うんきゅう) — classification of clouds
雲級
classification of clouds
雲級図 うんきゅうず
cloud atlas
級 きゅう
(school) grade; year; class
一級 いっきゅう
one grade; first-class; primary
分級 ぶんきゅう
classification (of particles, using fluid resistance)
二級 にきゅう
second grade; second class; secondary