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- 他们打算改革监狱制度的想法纯粹是空中楼阁。
Their ideas about reforming the prison system are just pie in the sky.
- 他脑袋里满载着空中楼阁回到了寄宿处。
He returned to his lodgings with his head full of castles in the air.
- 空中楼阁，要有一大笔费用来维持。
Castles in the air cost a vast deal to keep up.
- 他脑袋里装载着空中楼阁回到了寄宿处。
He returned to his lodging with his head full of castle in the air.
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