instantaneous center of relative velocity

例句：

1. 1. The car was traveling at an instantaneous speed of 60miles per hour.
   汽车以每秒60英里的速度行驶。
2. 2. The scientist made an instantaneous decision to switch to adifferent method.
   科学家立刻决定改变方法。
3. 3. Theexplosion was instantaneous and caused significantdamage.
   爆炸是瞬间发生的，造成了严重的破坏。