A person who is confined and deprived of freedom; someone trapped in a restricted environment.
他年轻时意气风发，如今却像笼鸟池鱼，被困在这狭小的世界里，再也无法施展抱负了。
He was full of vigor in his youth, but now he is like a caged bird or a fish in a pond, trapped in this small world and unable to realize his ambitions.
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