low speed rolling

例句：

1. 1. The car was moving at a low speed rolling down the hill.
   汽车在缓慢滚动下山。
2. 2. The machine is designed to operate at low speed rolling.
   这台机器设计成可以在低速滚动运行。
3. 3. The train is traveling at a low speed rolling through the tunnel.
   火车正在以低速滚动通过隧道。