spline shaft的用法和样例：
例句
- The fracture is mainly caused by the lower hardness and strength which resulted from the Widmanstatten structure existing in the structure of the spline shaft.
花键轴的显微组织中存在魏氏组织，导致其硬度和强度低于技术要求，是造成花键轴断裂的根本原因。 - The splinted shaft is made of alloy and the surface is specially treated, its abrasion performance and fatigue strength is enhanced.
花键轴采用合金材料进行特殊表面处理，提高了耐磨性及疲劳强度。
