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Từ điển Oxford Advanced Learner 8th
build castles in the air
(build) castles in the ˈair idiom
(BrE)(to have) plans or dreams that are not likely to happen or come true
• As a child he would wander round the boatyards, building castles in the air about owning a boat one day.
Main entry: ↑castleidiom
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