noun🔗Share肚脐，脐。 Navel"The doctor examined the newborn baby's umbilicus to make sure it was healing properly. "医生检查了新生儿的肚脐，确保它愈合良好。anatomybodyorganphysiologymedicineChat with AIVocabulary GamePractice Reading
noun🔗Share脐, 肚脐 Hilum"The bean's umbilicus, a small scar where it detached from the pod, was clearly visible. "这颗豆子的脐，也就是它从豆荚上脱落后留下的小疤痕，清晰可见。anatomybiologybodymedicineorganpartChat with AIVocabulary GamePractice Reading
noun🔗Share脐孔 A depression or opening in the center of the base of many spiral shells."The small snail shell showed a deep umbilicus at its base, a characteristic feature of that species. "这个小蜗牛壳底部有一个很深的脐孔，是该物种的典型特征。biologyanatomyanimalChat with AIVocabulary GamePractice Reading
noun🔗Share羽柄孔 Either of the two apertures in the calamus of a feather."The birdwatcher carefully examined the feather, noting the tiny umbilicus on each barbule. "观鸟者仔细检查了羽毛，注意到每根小羽枝上都有微小的羽柄孔。anatomybirdChat with AIVocabulary GamePractice Reading
noun🔗Share脐带, 连接管。 A tube connecting an astronaut or spacecraft to the mothership, through which supplies and samples can be transferred."During the spacewalk, the astronaut remained safely connected to the spacecraft by the umbilicus, ensuring a constant supply of oxygen and a secure return. "在太空行走期间，宇航员通过连接管（就像脐带一样）安全地连接在飞船上，保证了氧气的持续供应和安全返回。spacetechnologyvehiclemachinetechnicalChat with AIVocabulary GamePractice Reading
noun🔗Share焦点 One of the foci of an ellipse or other curve."Imagine an oval running track: the position where the starting gun fires is one umbilicus, and where the finish line tape is stretched is the other. "想象一下一个椭圆形的跑道：发令枪响的位置是其中一个焦点，终点线的横跨位置是另一个焦点。mathChat with AIVocabulary GamePractice Reading
noun🔗Share脐，脐点 A point of a surface at which the curvatures of the normal sections are all equal to each other."A sphere may be osculatory to the surface in every direction at an umbilicus."在脐点处，一个球面可以在表面的各个方向上与该表面密切相切。anatomymedicinebiologyphysiologyChat with AIVocabulary GamePractice Reading
noun🔗Share卷轴轴头 An ornamented or painted ball or boss fastened at each end of the stick on which manuscripts were rolled."The scribe carefully polished the umbilicus of the scroll, admiring the intricate gold leaf design on the small, ornamented boss. "抄写员小心翼翼地打磨着卷轴的轴头，欣赏着那个小巧华丽的轴头上精美的金箔图案。artwritingliteraturearchaeologyhistorymaterialitemChat with AIVocabulary GamePractice Reading
