velocity of rotation

• 旋转速度

velocity of rotation的用法和样例：

例句

1. Rotation speed is one of the key reasons which are relative to the quality of friction stir welds and tunnel defect existes at lower rotation speed.
   搅拌工具旋转速度是影响接头成型形貌的关键原因之一，速度过低有可能会导致隧道型孔洞缺陷。
2. Hubble helped astronomers determine the masses of several black holes by measuring the velocities of material whirling around them.
   哈勃帮助天文学家确定了若干个黑洞，通过测量物质的他们周围的旋转速度。