gāotiě zuòwèi chángyòng shùzì jiā zìmǔ bǐrú shí'èr A shí'èr B shí'èr F

高铁座位常用数字加字母，比如 12A、12B、12F。

High-speed train seats are usually labeled with a combination of numbers and letters, such as 12A, 12B, and 12F.