Last Updated：2025/11/22
Sentence
その天文学者は、宇宙の初期の揺らぎをたどるために、深宇宙から地球に届く点源ではない電磁放射（宇宙背景放射）を注意深く測定した。
Quizzes for review
The astronomer carefully measured the cosmic background radiation to trace the universe's earliest fluctuations.
See correct answer
The astronomer carefully measured the cosmic background radiation to trace the universe's earliest fluctuations.
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