这些防洪大堤中最低的那些堤坝被建设来承受千年一次的潮汐波浪。
The lowest of those levees were built to withstand a one-in-1,000-year tidal surge.
森林仅仅燃烧一次就能留下足够的黑碳，来保持数千年土壤肥沃。
Burning the forest just once can leave behind enough black carbon to keep the soil fertile for thousands of years.
列入关注的理由： 默拉皮火山属于普林尼式喷发，大约每千年大规模爆发一次（喷涌而出的岩浆总量可达1立方千米，漫天飞扬的火山灰足有20至50千米高）。
Reasons to worry: Merapi is capable of producing a Plinian eruption (spewing at least 1 cubic kilometer of magma and producing 20 to 50 kilometer-high ash columns)every 1,000 years or so.
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