運転ichi1 news1 nf02(unten); 牽引(economic growth, etc., けんいん); けん引(economic growth, etc.); くいの打ち込みRiver and Water Resources Glossary (Infrastructure Development Institute Japan) ; 打込み井戸の掘り方、 いどのほりかたRiver and Water Resources Glossary (Infrastructure Development Institute Japan)
