Last Updated：2025/11/20
Sentence
現地の生物学者たちは、外殻（石灰質の殻）や内骨格を持つ有孔虫の試料を採取し、殻の組成変化を調べた。
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Field biologists collected samples of testate foraminifera to study changes in shell composition over time.
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Field biologists collected samples of testate foraminifera to study changes in shell composition over time.
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