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)。
2
This will promote the farther spread of permanent pipeline sprinkler irrigation system.