velocity measurement

例句：

1. 1. To measure the speed of a car, we use a stopwatch.
   为了测量汽车的速度，我们使用手表。
2. 2. The scientist used a velocity measurement to study the motion of particles.
   科学家使用速度测量来研究粒子的运动。
3. 3. The team's performance was measured by their velocity measurement.
   团队的表现通过他们的速度测量来衡量。