self-propelled crust breaker

例句：

1. 1.The self-propelled vehicle has become a popular choice for transportation in recent years.
   近年来，这种自我推进的车辆已成为交通领域的热门选择。
2. 2. The self-propelled train is faster and more efficient than the traditional train.
   这种自我推进的火车比传统火车更快、更高效。
3. 3.The self-propelled car is perfect for commuting during rush hour traffic.
   这种自我推进的汽车非常适合在高峰时段通勤使用。