annulus
n. 环；轮；体环；[数]圆环域
名词复数：annuluses
近义词：circle，skirt，ring，halo，anchorring，doughnut，
英英释义
Noun
- a toroidal shape;
"a ring of ships in the harbor" "a halo of smoke"
- (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar
例句
用作名词(n.)
- What touch with vaccinal annulus is adhesive.用接种环触之有粘性。
- The thin ring of sunshine encircling the moon during an annular eclipse is called an annulus.在日环食期间，绕着月亮的那轮浅浅的太阳光就被称为环面。