bump leveller

例句：

1. 2.
   使
2. 3.
   使
3. 1. The bumper sticker on the car read "Drive safely."
   汽车上的保险杠贴纸写着“安全驾驶”。
4. 2. The bumper stickers on the wall were all about road safety.
   墙上的保险杠贴纸都是关于道路安全的。
5. 3. The bumper sticker on the car was a warning to other drivers.
   汽车上的保险杠贴纸是警告其他驾驶员的。