YOU SAID:

icelands volcano was pretty pointless because people mitigated AGAINST IT efficiently

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アイスランドの火山は、人々がそれに対して効率的に緩和したので、かなり無意味でした

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Icelandic volcanoes were pretty pointless as people mitigated them efficiently

INTO JAPANESE

アイスランドの火山は、人々がそれらを効率的に緩和したので、かなり無意味でした

BACK INTO ENGLISH

Icelandic volcanoes were pretty pointless as people mitigated them efficiently