1·If you don't study hard from now on, your ambition to enter Tsinghua University will be just a castle in the air.
如果你不从现在开始就努力学习，你考进清华大学的抱负就是异想天开。
2·Your plan is merely a castle in the air.
你的计划仅是空中楼阁而已。
3·H is plan was only a castle in the air.
他的计划只是空中楼阁而己，掌上英语学习机。
4·Your plan is merely a castle in the air.
你的计划不过是空中楼阁而已。
5·Your scheme is merely a castle in the air.
你的计划只不过是空中楼阁。
6·Their plan is nothing but a castle in the air.
他们的计划只不过是空中楼阁。
7·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。
8·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。
9·Without it, the health of our minds is just like castle in the air.
没有它，我们的头脑健康，就像空中楼阁。
10·Those beautiful like a castle in the air, and hollow crowd away already.
那些似空中楼阁一般的美好，与空洞的人群已然渐行渐远。