metering pump

例句：

1. 1. The engineer installed a new measuring pump to improve the accuracy of the water level measurement.
   工程师安装了一个新的测量泵，以提高水位测量的准确性。
2. 2. The metrologist used the new pump to measure the flow rate of the river accurately.
   水文学家使用这个新泵准确地测量了河流的流速。
3. 3. The construction crew replaced the old pump with a more efficient model for better efficiency in the operation of the water treatment plant.
   施工团队用更高效的模型替换了旧的泵，以更好地操作水处理厂。