At the least, irrigation can lessen the damage from huge temporary swings in rainfall (even if it can't do much about huge permanent swings in rainfall).

至少，灌溉可以缓解因降雨临时性的巨大变动造成的危害(即使它无法应对降雨量永久改变也罢)。

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This will promote the farther spread of permanent pipeline sprinkler irrigation system.

为促进固定式管道喷灌系统的进一步推广提供了新的证据。

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David Stower, Permanent Secretary of the Ministry of Water and Irrigation of Kenya.

UNESCO: EDUCATION

We help these families have permanent land for cultivation, we help them access modern technology with low-water-intake drip irrigation, we create village reservoirs for year-round water, and then we teach them to produce fruits and vegetables with a harvest every two weeks so they can sell year round.

FORBES: Why the Ivory Problem Requires Dealing with Supply Not Demand