Doppler flowmeter

例句：

1. 1. The Doppler flowmeter isused to measure the speed of a movingobject.
   多普勒流量计用于测量移动物体的速度。
2. 2. The engineer used the Doppler flowmeter to detect the location ofthe leak in the pipeline.
   工程师使用多普勒流量计检测管道中泄漏的位置。
3. 3.The Doppler flowmeter was crucialin the development of early navigation systems.
   多普勒流量计在早期导航系统的发展中起到了关键作用。