It is important, but now it is difficult to measure pump flow accurately in the clinical application.

临床应用中，对人工心脏的输出流量进行及时、精确的检测十分必要，但实现起来却比较困难。

youdao

This is already beginning to happen in parts of both India and China, where farmers are learning how to measure the water they pump, how to use it to greatest effect and thus how to sustain aquifer levels.

ECONOMIST: Water