noun 下载 🔗分享 肚脐，脐。 Navel Examples : "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。 anatomy body organ physiology medicine 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 脐, 肚脐 Hilum Examples : "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。 anatomy biology body medicine organ part 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 脐孔 A depression or opening in the center of the base of many spiral shells. Examples : "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。 biology anatomy animal 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 羽柄孔 Either of the two apertures in the calamus of a feather. Examples : "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。 anatomy bird 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 脐带, 连接管。 A tube connecting an astronaut or spacecraft to the mothership, through which supplies and samples can be transferred. Examples : "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。 space technology vehicle machine technical 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 焦点 One of the foci of an ellipse or other curve. Examples : "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。 math 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 脐，脐点 A point of a surface at which the curvatures of the normal sections are all equal to each other. Examples : "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。 anatomy medicine biology physiology 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 卷轴轴头 An ornamented or painted ball or boss fastened at each end of the stick on which manuscripts were rolled. Examples : "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。 art writing literature archaeology history material item 与AI对话词汇游戏阅读练习
