双船级的英文

• dual class
• dualclass

• 双:    two; twin; both; dual
• 船级:    ship's classification; ship' ...
• 船级:    (表明船舶技术性能优良程度的一种称号) ship's classification; ship's class◇船级条款 [航运] classification clause; 船级证明书 ship's classification certificate; 船级证书 certificate of class; classification certificate; 船级证书付本 copy of class certificate
• 双船体:    catamaran hull
• 双船闸:    double lock