A fleeting illusion; a pipe dream; a baseless or vain hope, often referring to life's ephemeral nature or unfulfilled ambitions, like the dream of golden millet.
他一直以为自己能实现那个宏伟的计划，结果却发现那不过是一场黄梁一梦。
He always thought he could realize that grand plan, but it turned out to be nothing more than a pipe dream.
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