envelope

n.

信封，封皮；壳层，外壳；包裹物；[生物学]膜，包袋

复数：envelopes

flight envelope飞行包线

nuclear envelope核膜；核被膜

envelope curve包络曲线；包迹

failure envelope断裂点轨迹；破坏包络线

push the envelope挑战极限；接近甚至超越安全限度；越过底线

glass envelope玻璃封装；玻壳

1. There are several enclosures in the envelope.
   信封内装有几份附件。
2. I use a prepaid envelope.
   我用了一个邮资已付的信封。
3. He glued a stamp onto the envelope.
   他把邮票贴在信封上。
4. The surface of the sun is a glowing gas envelope.
   太阳的表面是一层炽热的气体层。
5. The papers are enveloped by plastic bag.
   论文用塑料纸包封好了。

The HIV-1 envelope glycoproteins: fusogens, antigens, and immunogens
Superlattice band structure in the envelope-function approximation
Rational Design of Envelope Identifies Broadly Neutralizing Human Monoclonal Antibodies to HIV-1
INFECTIOUS HEPACIVIRUS PSEUDO-PARTICLES CONTAINING FUNCTIONAL E1, E2 ENVELOPE PROTEINS
Infectious hepacivirus pseudo-particles containing functional e1, e2 envelope proteins
Infectious Hepatitis C Virus Pseudo-particles Containing Functional E1–E2 Envelope Protein Complexes
Surface proteins of gram-positive bacteria and mechanisms of their targeting to the cell wall envelope
Predicting the Impacts of Climate Change on the Distribution of Species: Are Bioclimate Envelope Models Useful?
American pikas inhabit low-elevation sites outside the species' previously described bioclimatic envelope.
Pearson, R. G. & Dawson, T. P. Predicting the impacts of climate change on the distribution of species: are bioclimate envelope mode...