另一方面，如果有更多的水蒸气，难道不会产生更多的云层吗？
On the other hand, with more water vapor wouldn't there be more clouds?
热与冰的交互作用把岩浆雾化成比通常的火山灰更为纯净的微粒，同时，它产生的蒸气云把火山灰送到了比通常更高的高空。
The interaction of heat and ice atomized the magma into much finer particles than is typical, and created a steam cloud that sent the ash higher than usual into the air.
然而，蒸汽是需要燃烧其他燃料来产生的——一般来说是天然气——因为加热岩石需要很多的蒸气，那么制造这些蒸汽的成本就会很高。
The steam, however, is made by burning other fossil fuels-normally natural gas-and because heating rock takes a lot of steam, making that steam takes a lot of money.
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