spline shaft的用法和樣例：
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.
花鍵軸的顯微組織中存在魏氏組織，導致其硬度和強度低於技術要求，是造成花鍵軸斷裂的根本原因。 - The splinted shaft is made of alloy and the surface is specially treated, its abrasion performance and fatigue strength is enhanced.
花鍵軸採用合金材料進行特殊表面處理，提高了耐磨性及疲勞強度。
