locomotive tractive characteristic curve

例句：

1. 1. The train was pulled by a powerful locomotive.
   这列火车被一台强大的机车拉动。
2. 2.The engineer had to repair the locomotive before it could start again.
   工程师必须在火车再次启动前修理好机车。
3. 3.The locomotive was used to transport passengers and goods across long distances.
   机车被用来在长距离内运输乘客和货物。