a castle in the air中文什么意思

空中楼阁

• castle:    n. 1.城；(城堡形)建筑物。 2 ...
• air:    n. 1.空气，大气。 2.天空，空 ...
• air castle:    空中楼阁，妄想。

例句与用法

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1. Your plan is merely a castle in the air .
   你的计划不过是空中楼阁而已。
2. Your plan is merely a castle in the air
   你的计划只不过是口中楼阁而已。
3. 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。
4. 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。
5. 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。