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pipe dream

noun
🔊/ˈpaɪp driːm/
🔊/ˈpaɪp driːm/
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  1. a hope or plan that is impossible to achieve or not practical脱离实际的愿望；行不通的计划；妄想Topics Difficulty and failurec2
    Word Originlate 19th cent.: referring to a dream experienced when smoking an opium pipe.