keeln.(船的)龙骨v.(船)倾覆；突然倒下；出问题keel curve direction弯曲方向Keel-billed Toucann.厚嘴巨嘴鸟keel laying ceremony起工式Keelboat men - Star男子星光级keel disease of ducks幼鸭败血病Keel over with laughter笑得前俯后仰keel-centerboard yawl龙骨稳舵小帆船Keelboat women-Yngling女子索林级。keel-and-bilge block垫船木块Keel-Cellano antibodies凯尔-塞拉诺二氏抗体