traction transformer of threephase three winding connection

例句：

1. 1. The car's traction ispoor on the wet road.
   这辆车在湿滑的路面上的牵引力很差。
2. 2.The train has a strong traction systemto overcome the rough terrain.
   火车有强大的牵引系统来克服崎岖的地形。
3. 3. Theheavy load required more traction than theengine could provide.
   沉重的负载需要比引擎能提供的更多的牵引力。