词汇	have a duty
释义	have a duty 有义务
随便看	Intervertebral bone grafting Intervertebral cage intervertebral cages fusion intervertebral cartilage intervertebral cartilages Intervertebral chemonucleolysis intervertebral disc Inter vertebral disc inter-vertebral disc Intervertebral disc cell Intervertebral disc cells Intervertebral discceu culture Intervertebral Disc Chemolysis Intervertebral disc degeneration Intervertebral disc degenerative intervertebral disc destabifization Intervertebral disc diseases Intervertebral disc disorder Intervertebral disc disorder with myelopathy Intervertebral disc displacement Intervertebral disc-displacement Intervertebral Disc Displacements Intervertebral discectomy intervertebral disc endoscope intervertebral disc extraction