annulus
环面,环形物,环形区,环形结构
Definitions
- 1
plural an·nu·li [an-yuh-lahy], /ˈæn yəˌlaɪ/, an·nu·lus·es.
- : a ring; a ringlike part, band, or space.
- : Geometry. the space between two concentric circles on a plane.
- : the veil remnant on a mushroom stalk.
- : a growth ring, as on the cross section of a tree trunk, that can be used to estimate age.
Examples
Stonecutters Bridge in Hong Kong, which opened in December 2009, featured giant towers composed of 32 stainless-steel segments wrapped around a concrete annulus.
That meant the region in which the center would balance was a ring, or annulus.
Thus a hot hoosh is preparing in the central vessel side by side with the melting of snow for cocoa or tea in the annulus.
Mettenius had laid stress upon various characters, but especially on the oblique annulus as distinctive.
A distinctive feature is the incomplete annulus of the sporangium.
The sporangia have very short stalks, and are not provided with an annulus at all.
The rocky annulus which surrounds it is very lofty and precipitous, and at one point reaches a height of 17,300 feet.