boxcar lengthener

例句：

1. 1. The boxcar was the only way to get to the station.
   这个火车车厢是去车站的唯一方式。
2. 2. The boxcar lengthener was a great help in getting the job done.
   这个火车车厢长度调节器在完成这项工作中起到了很大的帮助。
3. 3. The boxcar lengthener was used to adjust the length of the train.
   这个火车车厢长度调节器用于调整火车的长度。