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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.
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.
spew, gush / erupt, explode in anger etc.
The volcano spewed smoke.
solution
It will take time to solve this problem.
figure out, determine, solve, clarify
He is working hard to figure out the mystery.
benefit (be or provide a benefit to)
This app provides useful information for everyday life.
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