starting tractive effort

例句：

1. 1. The starting tractive effort of the engine is crucial for efficient operation.
   发动机的起始牵引力对于高效运行至关重要。
2. 2. The team's starting tractive effort was impressive, but they still needed to improve their technique.
   团队的起始牵引力令人印象深刻，但他们仍需改进技术。
3. 3. The new design uses a more powerful motor to provide a better starting tractive effort.
   新设计使用了更强大的电动机，以提供更好的启动牵引力。