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serene | |||
cloudless atmosphere | |||
clear sky | |||
blue sky; clear air; cloudless sky |
晴空 : 35 phrases in 10 subjects |
Air defense | 1 |
Aviation | 6 |
Cartography | 2 |
Desert science | 1 |
Earth sciences | 3 |
General | 4 |
Space | 6 |
Technology | 9 |
Textile industry | 2 |
Wind Energy | 1 |