天马行空 Celestial Horse Galloping Through the Sky
Explanation
比喻想法或行为不受拘束，不受现实限制，也形容诗文豪迈奔放。
It is used to describe thoughts or actions that are unrestrained, not limited by reality. It is also used to describe poetry that is powerful and free-flowing.
Origin Story
传说，天马是一种神马，速度快如闪电，能在天空飞翔，神通广大。唐代诗人李白，他的诗歌豪迈奔放，充满了浪漫主义色彩，就像天马行空一样，自由自在，无拘无束。他曾经写下“仰天大笑出门去，我辈岂是蓬蒿人”的豪迈诗句，表达了他对世俗生活的蔑视和对理想的追求。
Legend has it that the celestial horse is a divine steed, as fast as lightning, able to fly through the sky, with great magical powers. Li Bai, a poet from the Tang Dynasty, wrote poems that were free and full of romanticism, like a celestial horse galloping through the sky, free and unrestrained. He once wrote the powerful lines “I laugh to the heavens and go out, we are not people from the weeds.”
Usage
形容想法、言论、行动等不受拘束，不受现实限制，也形容诗文豪迈奔放。
It is used to describe thoughts, speeches, actions, etc. that are unrestrained, not limited by reality. It is also used to describe poetry that is powerful and free-flowing.
Examples
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他的想象力天马行空，写出的故事充满奇思妙想。
ta de xiang xiang li tian ma xing kong, xie chu de gu shi chong man qi si miao xiang.
His imagination is boundless, and the stories he writes are full of imaginative ideas.
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这个方案太天马行空了，实施起来难度很大。
zhe ge fang an tai tian ma xing kong le, shi shi qi lai nan du hen da.
This plan is too utopian and its implementation is very difficult.
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他的演讲天马行空，充满了激情和创造力。
ta de yan jian tian ma xing kong, chong man le ji qing he chuang zao li.
His speech was free and full of passion and creativity.