Dulla杜拉dulladj.呆滞的；钝的；迟钝的；无趣的；暗的v.变钝；迟钝dull apex tracing[医] 钝尖描记法dullness analysis磨损分析dull Berlin black无光黑沥青漆dull purple beans暗紫色豆dull brown teapot紫砂茶壶dull emitter tube省电管dull walls x-ray双壁透照Dull and shameless玩钝无耻dull in appearance外表呆板dull pain in liver肝区隐痛