那些火车迷们带着相机和笔记本，专注地记录着每一列经过的火车编号。

The ___trainspotters stood by the tracks with cameras and notebooks, carefully noting down each passing train's number.

那些火车迷们连最微小的引擎型号差异都能滔滔不绝地讨论上几个小时。

The ___trainspotters could talk for hours about the tiniest differences in engine models.