bull rod

• 钻杆,盘条

bull rod的用法和样例：

例句

1. The coil,or helical,spring consists of a wire or rod wound into a helix and is primarily intended for axial direct compression or tension loads.
   卷簧，或者说螺旋形弹簧包括一条盘成螺旋形的金属丝盘条，它起初是用于轴向直接压力和拉伸。