built-up crank axle

例句：

1. 1.The engineer designed the car with a built-up crank axle that could handle heavy loads.
   工程师设计了一款使用堆砌式曲轴的汽车，能够承受重载。
2. 2. The old truck had a worn-out built-up crank axle, which made it difficult to start.
   这辆旧卡车的堆砌式曲轴磨损严重，难以启动。
3. 3. The new model car has a more advanced built-up crank axle system that improves fuel efficiency.
   新款汽车采用了更先进的堆砌式曲轴系统，提高了燃油效率。