Last Updated：2025/11/19
Sentence
地質学者たちは、その変動を調べるために、異なる高度で自然環境に存在する電離放射線を測定した。
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Geologists measured the background radiation at different elevations to study its variation.
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Geologists measured the background radiation at different elevations to study its variation.
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Related words
background radiation
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