Wèi le lǐ xiǎng, tā tà shàng le jiān nán de zhēng chéng.
For the sake of his ideals, he embarked on a difficult journey.
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征程 is more literary and elevated than 旅程 (lǚchéng, trip/journey). It implies a purposeful, often arduous mission or cause — commonly used in political, patriotic, or inspirational contexts.
