castle in the air,空中之城？开什么玩笑！
castle in the air，castle本身是城堡的意思，air是空气的意思，那castle in the air是不是就是空中城堡的意思呢？
不是哦，castle in the air是海市蜃楼的意思，指代缥缈之物。
举例而言
1
He's only building a castle in the air.
他只不过是在做白日梦。
2
Instead of working hard at her lessons, mary spends her time building a castle in the air.
玛丽不用功读书，却花时间去幻想。
3
My plan for the summer vacation proved to be a castle in the air.
我为暑期做的计划看来是空中楼阁了。
4
Their plan is nothing but a castle in the air.
他们的计划只不过是空中楼阁。
5
Grand as the plan sounds, it may prove to be a castle in the air.
这个计划听起来倒是很宏伟，实际上可能只是个空中楼阁。
6
Your plan is merely a castle in the air.
你的计划只不过是口中楼阁而已。
7
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。
8
You must study harder and harder, otherwise entering college may prove to be a castle in the air.
你学习必须努力，否则上大学可能是空中楼阁罢了。
9
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。
10
Their plan is merely a castle in the air because it is simply impracticable.
他们的计划不过是空中楼阁而已，因为它根本行不通。
11
Mr. Bush tries to spend billions of dollars for missile defense system which some countries view as building a castle in the air.
布希先生想花亿万经费发展飞弹防卫系统，一些国家认为不切实际。
12
This study is not a castle in the air, but appreciates a solid foundation that has been laid by scholars both at home and abroad: studies of politeness and verbal offence.
语用冒犯研究并非空中楼阁，而是有着国内外学者们建立的坚实的基础：礼貌研究和言语冒犯研究。
13
However, Fodor's conclusion raises problems for his intentional realist argument: if thinking is not computation, Fodor's intentional realism becomes a castle in the air.
然而，福多的结论给他的计算主义的意向实在论辩护带来了问题：如果思维不是计算，那么，福多关于常识心理学所持的意向实在论主张就成了空中楼阁。
14
Heart on the road, feet not on the road, the front is always a mirage, castle in the air.
心上路，脚不上路，前方永远是海市蜃楼、空中楼阁。
你学会了吗？
