Last Updated：2025/11/22
Sentence
天文学者たちは、40年の軌道を持つこれまで記録されていなかった周期彗星を発見して興奮した。
Quizzes for review
The astronomers were excited when they discovered a previously unrecorded periodical comet with a forty-year orbit.
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The astronomers were excited when they discovered a previously unrecorded periodical comet with a forty-year orbit.
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Related words
periodical comet
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