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| 画角 (gakaku) River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 視角レンズの、 レンズの (shikaku) River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 写角 (shakaku) River and Water Resources Glossary (Infrastructure Development Institute Japan) ; レンズ開角 River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
