What he is talking about is just a castle in the air.

他所谈论的一切,只不过是空中楼阁.

辞典例句

Agricultural production is assisted is more a castle in the air.

农业生产辅助更是“空中楼阁”.

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It is out of the question for anyone to build a castle in the air.

任何人想建立空中楼阁都是不可能的.

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Humanity spirit will a castle in the air if man's desire cannot be satisfied.

如果人的欲望都难以得到满足的话,那么人文精神也就无从谈起.

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Nobody is safer than he who lives in a castle in the air.

生活在空气城堡中的人是最安全的.

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