major axis of flexspline

例句：

1. 1. The machine uses a flexspline to connect the shaft and the pulley.
   这台机器使用弹性联轴器将轴和滑轮连接起来。
2. 2. The engineer designed the new flexspline for better efficiency.
   工程师设计了新的弹性联轴器以提高效率。
3. 3. The flexible spline is used in many industrial applications to reduce wear and extend lifespan.
   在许多工业应用中，弹性联轴器被用来减少磨损并延长使用寿命。