不远万里 thousands of miles
Explanation
形容距离很远，不把万里路程看作遥远。表示不畏艰险，长途跋涉。
Describes a very long distance and the fact that thousands of miles are not considered far. It expresses fearlessness in the face of danger and long journeys.
Origin Story
唐玄奘法师为了求取真经，不远万里从大唐出发，历经千辛万苦，西行取经，最终取得真经，回到大唐，造福百姓。他这种不畏艰险，勇于探索的精神，令人敬佩。
The Buddhist monk Xuanzang traveled thousands of miles from the Tang Dynasty in ancient China to seek Buddhist scriptures. He endured countless hardships on his westward journey to obtain the scriptures, and finally returned to the Tang Dynasty, benefiting the people. His fearless spirit and courage to explore are admirable.
Usage
用作谓语、状语；形容路途遥远。
Used as predicate and adverbial; describes a long distance.
Examples
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为了完成学业，他远渡重洋，不远万里来到中国留学。
Wèile wánchéng xuéyè, tā yuǎndù chóngyáng, bù yuǎn wàn lǐ lái dào zhōngguó liúxué. Wèile zhǎo xiún shī sàn duō nián de qīn rén, tā fānshān yuè lǐng, bù yuǎn wàn lǐ lái dào zhèlǐ
To pursue his studies,he crossed the ocean and traveled thousands of miles to study in China.
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为了寻找失散多年的亲人，他翻山越岭，不远万里来到这里。
To find his long-lost relatives, he traveled thousands of miles to this place over mountains and valleys.