换速

例句：

1. 1. The car's engine has been swapped out for a more powerful one.
   汽车的引擎已经被换成了更强大的一个。
2. 2. The train is switching tracks to avoid the traffic jam.
   火车正在换轨道以避免交通堵塞。
3. 3. The team is trying to speed up their progress by working overtime.
   团队正在努力加班以加快他们的进度。