DictionaryForumContacts

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to phrases
clear sky
avia. 碧空
desert. 晴空
space 碧空 (总云量小于八分之一)
tech. 无云天空; 晴朗天空总云量少于1/8
clear sky: 9 phrases in 5 subjects
Agriculture1
Earth sciences2
General2
Space2
Technology2