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| 平衡圏 River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 緯線 (いせん) River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
| 平行圈 (へいこうけん) | |||
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parallel circle : 3 do fraz, 1 tematyki |
| Technika i technologia | 3 |