n. a flat (usually rectangular) container for a letter, thin package, etc.
n. any wrapper or covering
n. a curve that is tangent to each of a family of curves
词态变化
原型:envelope
变形:s3
常见例句
1
a book of blank pages with pockets or envelopes
2
originally released on 12-inch phonograph records (usually with attractive record covers) and later on cassette audiotape and compact disc n a book of blank pages with pockets or envelopes
3
Having some portion of the floral envelopes attached to the pericarp to form the fruit, as in the checkerberry, the mulberry, and the pineapple.
4
fleshy and usually brightly colored cover of some seeds that develops from the ovule stalk and partially or entirely envelopes the seed
5
animal reproductive body consisting of an ovum or embryo together with nutritive and protective envelopes
