Last Updated：2025/11/21
Sentence
大雨の後、環境化学者たちは川の硫酸塩濃度が上昇していることを確認した。
Quizzes for review
Environmental chemists measured increasing concentrations of sulphates in the river after the heavy rains.
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Environmental chemists measured increasing concentrations of sulphates in the river after the heavy rains.
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