blue sky
definitions
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The clear, cloudless expanse of the atmosphere visible from Earth, typically appearing blue during daylight hours due to the scattering of shorter wavelengths of sunlight.ru: ясное голубое небо
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Highly imaginative, theoretical, or speculative ideas and research that are not restricted by practical constraints, budget limits, or immediate commercial viability.ru: теоретические идеи
examples
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The big silver ship flew high into the blue sky.
Большой серебряный корабль взмыл высоко в голубое небо.
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The company encourages blue sky thinking to foster innovation among its engineers.
Компания поощряет свободное мышление, чтобы стимулировать инновации среди своих инженеров.