liquid flow indicator

例句：

1. 1.The liquid flow indicator is used to measure the rate of fluid movement.
   液体流动指示器用于测量流体移动的速度。
2. 2. The engineer used the liquid flow indicator to monitor the water level in the reservoir.
   工程师使用液体流动指示器来监测水库中的水位。
3. 3. The liquid flow indicator was crucial for ensuring the safe operation of the chemical plant.
   液体流动指示器对于确保化工厂安全运行至关重要。