An expert on farmland irrigATion says thAT underground irrigATion is the best way to wATer crops. It puts wATer where it is most needed AT the roots.

一位灌溉专家说，地下灌溉是给作物供水的最佳方法，因为它把水灌到最需要的地方。即根系近旁。

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Theoretical analysis of local-control irrigation, i. e. , non-pressure underground irrigation, is conducted, and soil water movement equation is presented.

对局部控水灌溉（无压地下灌溉）技术从理论上进行了分析，并给出了其土壤水分运动方程。

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Millions of irrigation wells in many countries are now pumping water out of underground sources faster than rainfall can refill them.

在许多国家，数以百万计的灌溉井现在从地下水源抽水的速度，超过了降雨所能再次填满的速度。

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The arborist added that sophisticated underground irrigation systems water the trees.

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But modern drip irrigation uses underground computerized probes and long plastic tubes to slowly release water over long distances.

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Now, in this warren of rooms, except for the muffled sound of the crowd above, the only sound was the whooshing of an underground stream, redirected here from Roman times for irrigation and cleaning.

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