They compared ash that was ejected in the early, explosive phase of the eruption with ash from a later, more typical eruption of the volcano.

他们比较了取自火山爆发期次的喷发早期的火山灰和取自典型火山喷发的喷发后期的火山灰。

youdao

Ash particles from the early part of the eruption were especially sharp and abrasive, posing a possible threat to aircraft flying through the cloud.

火山喷发早期出现的火山灰颗粒特别锐利且粗糙，对通过它的飞行器可能造成威胁。

youdao

"This eruption is directed right at us and is expected to get here early in the day on Aug. 4th," said Leon Golub of the Harvard-Smithsonian Center for Astrophysics.

“这次的太阳喷发直接吹向我们，而且将会在8月4日的早些时候到达，”哈佛—史密森天文中心的利昂·格勒布说。

youdao

Eyjafjallajokull's most recent previous eruption, from late 1821 to early 1823, also had quite viscous lava.

ECONOMIST: Volcanoes and air travel: Small eruption in Iceland | The

But a combination of circumstances meant that, though comparatively small, Eyjafjallajokull's current eruption punched above its weight in the ash-production league in its early days, emitting much more fine ash than is normal.

ECONOMIST: Volcanoes and air travel: Small eruption in Iceland | The