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噴出物: ejecta
The ejecta from volcanoes help to elucidate the geological history of the Earth.
ejecta
The ejecta from the volcano plays an important role in shaping the terrain.
geology
He is majoring in geology.
spew, gush / erupt, explode in anger etc.
The volcano spewed smoke.
volcanology
He is an expert in volcanology, studying volcanoes around the world.
study of history
He is majoring in history at university.
historic, historical / already-happened, past / former, old, traditional
This is a historic building.
benefit (be or provide a benefit to)
This app provides useful information for everyday life.
useless, deadhead, good-for-nothing, a piece of shit / (politics) lame duck
His advice was completely useless.
solution
It will take time to solve this problem.
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