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.es: cielo azul despejado
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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.es: ideas especulativas
examples
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The big silver ship flew high into the blue sky.
El gran barco plateado voló alto hacia el cielo azul.
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The company encourages blue sky thinking to foster innovation among its engineers.
La compañía fomenta el pensamiento de cielo azul para impulsar la innovación entre sus ingenieros.