wagon spring

例句：

1. 2.
   比喻
2. 3.
   比喻
3. 1. The wagon spring was broken, causing the cart to stop.
   车轴弹簧断了，导致马车停了下来。
4. 2. He had a spring in his step, as if he were eager to start the new job.
   他步伐轻快，好像迫不及待要开始新的工作。
5. 3. The old man's spring was weak, and he couldn't keep up with the younger generation.
   老人的意志不坚定，跟不上年轻人的步伐。