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English definition of “castles in the air”

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castles in the air

plans that have very little chance of happening
Translations of “castles in the air”
in Chinese (Traditional) 空中樓閣, 空想,幾乎不可能實現的計劃…
in Chinese (Simplified) 空中楼阁, 空想,几乎不可能实现的计划…
(Definition of castles in the air from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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