更改

由于行程发生紧急变动，他不得不致电客服中心更改原定的高铁车票日期。

yóu yú xíng chéng fā shēng jǐn jí biàn dòng, tā bù dé bù zhì diàn kè fú zhōng xīn gēng gǎi yuán dìng de gāo tiě chē piào rì qī.

Due to an emergency change in his itinerary, he had to call the customer service center to change the original date of his high-speed rail ticket.