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| 必須元素 River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
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| 生体必須元素 River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 必須元素 Life Science Dictionary (Shuji Kaneko) | |||
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essential elements : 4 短语, 1 学科 |
| 一般 | 4 |