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annulus

美['ænjuːləs] 英['ænjʊləs]

n. 环；轮；体环；[数]圆环域

名词复数：annuluses

近义词：circle，skirt，ring，halo，anchorring，doughnut，

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

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。

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