annulus

a ring-shaped or toroidal form

1. 1.

   A ring- or donut-shaped area, object, or structure.

   环形或甜甜圈形的区域、物体或结构。

2. 2.

   a toroidal shape

   环形体

3. 3.

   A ring of fibrous tissue; specifically (cardiology), such a ring around an opening of a heart valve, to which the valve leaflets and muscle fibres of the atria and ventricles are attached; an annulus fibrosus cordis.

   纤维组织环；特别是(心脏病学)心脏瓣膜开口周围的环,瓣膜小叶和心房心室的肌纤维附着于此；心脏纤维环。

4. 4.

   (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar

   (真菌)成熟蘑菇上围绕茎部如领圈的部分帷幕残余

5. 5.

   A ring of light in a celestial body, especially when caused by an annular eclipse (for example, when the Sun and Moon are in line with the Earth, but the Moon does not completely cover the Sun's disc).

   天体中的光环,尤其是由环形日食引起的(例如,当太阳和月亮与地球成一线,但月亮未完全遮住太阳的圆盘时)。

6. 6.

   A structure surrounding a sporangium (or part of it) which shrinks and causes it to rupture for spore dispersal; specifically, in a fern: a structure around about two-thirds of the sporangium consisting of differentially thick-walled cells which dry and distort the sporangium; and in a moss: a complete ring of cells around the tip of the sporangium which dissolves to cause the tip to detach.

   围绕孢子囊(或其一部分)的结构,收缩并导致其破裂以分散孢子；特别是在蕨类植物中:围绕约三分之二孢子囊的结构,由厚壁细胞组成,干燥并扭曲孢子囊；在苔藓中:围绕孢子囊顶端的完整细胞环,溶解导致顶端脱落。

7. 7.

   The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.

   部分菌幕的膜状残余物,在蘑菇的茎上留下一个环。

8. 8.

   A dark ring on a fish's scale that is formed when a fish's growth rate slows down in the winter due to low food intake and the scale's circuli move closer to one another. The dark ring is used to estimate the fish's age, approximately one year per annulus.

   鱼鳞上的黑色环,是由于冬季食物摄入量低导致鱼的生长速度减慢,鳞片的环纹靠近形成的。黑色环用于估计鱼的年龄,大约每个环代表一年。

9. 9.

   The region in a plane between two concentric circles of different radii.

   平面中两个不同半径同心圆之间的区域。

10. 10.

    Any topological space homeomorphic to the region in a plane between two concentric circles of different radii.

    任何拓扑空间,与平面中两个不同半径同心圆之间的区域同胚。

11. 11.

    In a well such as an oil well or water well: the space between a pipe or tube and any pipe, tube, casing, or sides of a hole surrounding it.

    在油井或水井中:管道或管子与周围的任何管道、套管或孔壁之间的空间。

环形或甜甜圈形的区域、物体或结构。；环形体；纤维组织环；特别是(心脏病学)心脏瓣膜开口周围的环,瓣膜小叶和心房心室的肌纤维附着于此；心脏纤维环。；(真菌)成熟蘑菇上围绕茎部如领圈的部分帷幕残余；天体中的光环,尤其是由环形日食引起的(例如,当太阳和月亮与地球成一线,但月亮未完全遮住太阳的圆盘时)。

In use

Connections

Learner notes