Be realistic! It is too risky o build castles in the air.

务实一点吧! 建造空中楼阁是危险的.

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Don't build castles in the air when you design this important project.

当你设计这项重要的计画时,不可成为空中楼阁,不切实际.

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Don't build castles in the air.

不要想些空中楼阁了.

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He liked to build castles in the air, but never succeeded in anything.

他喜欢想入非非, 却一事无成.

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Many who build castles in the air cannot build a hut on earth.

想入非非者无大用.

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