slot rolling

例句：

1. 1.The slot machine was a favorite pastime of the elderly.
   插槽机是老年人的最爱。
2. 2. The car's engine is so loud that it can be heard from a distance.
   汽车发动机的声音很大，可以远听得到。
3. 3. The ball rolled down the hill and landed in the bottom.
   球滚下山坡并落在底部。