动词短语
中文翻译：在空中建造城堡
同义词：
['虚构、创造、构建例句：1. The children were building castles in the sky with their imagination.（孩子们用想象力在空中建造城堡。）']
例句：
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1. The children were building castles in the sky with their imagination.
孩子们用想象力在空中建造城堡。
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2. The artist was building a castle in the air, using only his imagination.
这位艺术家只用他的想象力在空中建造一座城堡。
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3. The scientist was building castles in the air, testing different theories.
这位科学家用不同的理论在空中建造城堡，进行测试。