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梦想家;空想家;不切实际的人
If you describe someone as a dreamer, you mean that they spend a lot of time thinking about and planning for things that they would like to happen but which are improbable or impractical.
例句
Far from being a dreamer, she's a level-headed pragmatist.
她是个头脑冷静的务实派,绝不是一个不切实际的人。