... shaft bearing 轴承 shaft butt 轴端 shaft collar 轴肩档圈 ...
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butt shaft 射靶用的箭
Shock eraser insert: thermoplastic rubber core inside a thermoplastic elastomer butt cap is pressure fit into the shaft to reduce frame shock and vibration.
减震插片：拍柄内置热塑性橡胶内核同热塑性弹性体，有效减少球拍震动。
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