... volcanic gas 火山气体 ; 火山气 ; 火山岩气 ; 火山喷气 volcanic soil 火山土 ; 火山土壤 ; 矿物质的火山泥 volcanic eruptions 火山爆发 ; 火山喷发 ; 火山迸发 ; 火山活动 ...
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原因是，肥沃的火山土壤使这片土地极适于农业。
The reason is that rich volcanic soil makes the land fantastic for farming.
—通过化石周围的火山土壤层测定它的年份是440万年前。
Volcanic layers around the fossil were used to date it from 4.4million years ago.
喷发之前，由于火山土壤支撑着富饶的农业，人们几乎遗忘了这座山的危险性。
Prior to this eruption, the mountain's dangers had been largely forgotten as its volcanic soils supported abundant agriculture.
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