最終更新日：2025/11/21
After the chemical spill, scientists measured a sharp increase in the biochemical oxygen demand in the river, signaling higher levels of biodegradable contamination.
正解を見る
After the chemical spill, scientists measured a sharp increase in the biochemical oxygen demand in the river, signaling higher levels of biodegradable contamination.
音声機能が動作しない場合はこちらをご確認ください
編集履歴（0）
