事業者(じぎょうしゃ); 衛生管理者(えいせい・かんりしゃ)River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 作動遺伝子Life Science Dictionary (Shuji Kaneko)
オペレーター(A person who controls a machine or system, such as a computer or telephone switchboard, operētā); 演算子(A sign or symbol that specifies the type of calculation to perform within an expression. There are mathematical, comparison, logical, and reference operators, enzanshi)
