Others may be familiar with simple pumps or common pump motors.

其他人可能会对简易水泵或普通水泵发电机比较熟悉。

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For example, some individuals from rural communities may be experts at digging and maintaining Wells. Others may be familiar with simple pumps or common pump motors.

比如，一些从农村来的人可能擅长挖井、修井，还有一些人可能会使用简易水泵或普通的水泵发电机。

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The results show that for the common pump control methods, the third power relation between the pump rotate speed(water volume) ratio and the shaft power ratio is not true;

分析结果表明，对于常用的水系统控制方式而言，水泵转速（流量）比与轴功率比的三次幂关系不成立；

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To put that figure in context, Iannelli says that the energy required to pump freshwater from underground (which, he says, is the most common source of drinking water in the West) typically produces just over 1.5 tonnes of CO2 per million gallons.

CNN: Counting the carbon cost of bringing water to the desert