It is building castles in the air.

这是空中楼阁，想入非非。

Previous dream became the Castles in the air.

原来的理想成了“空中楼阁”。

Just like castles in the air, this idea is totally impractical.

你这个想法简直就是空中楼阁,不可能实现的!

Before you start building castles in the air, just think how much all this is likely to cost.

在你开始建立“空中楼阁”之前，不如先想想你需要付出多少代价。

She tells me she's planned out her whole career, but as far as I can see it's all just castles in the air.

她告诉我她已经有了整个职业计划，但是就我看来其实只是空中楼阁而已。

As he walked along, his brain was busy planning hundreds of wonderful things, building hundreds of castles in the air.

他一路走，他的小脑袋瓜里浮现出成千个幻想，成千座空中楼阁，越来越美。

His schemes are just castles in the air.

他的种种方案属空想。

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

想入非非者无大用.

His friends thought he was building castles in the air when he said he would travel to the Sahara.

当他说要到撒哈拉沙漠去旅行时，他的朋友们都认为他是在做白日梦。

His friends thought he was building castles in the air when he said he would travel to the Sahara .

当他说要到撒哈拉沙漠去旅行时，他的朋友们都认为他是在做白日梦。