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envelope 'envәlәup

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释义

n. 信封, 封套, 封袋
[医] 膜, 包袋

英文释义

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
n. a natural covering (as by a fluid)

词形变化

复数: envelopes 第三人称单数: envelopes

BNC词频排名: 3,672 | 当代语料库词频排名: 3,879