| 单词 | envelopes | 
| 释义 | envelopenoun  en·ve·lope  ˈen-və-ˌlōp  1   : a flat usually paper container (as for a letter)   2   : something that envelops : wrapper  the envelope of air around the earth 3  a    : the outer covering of an aerostat    b    : the bag containing the gas in a balloon or airship   4  a    : a natural enclosing covering (such as a membrane, shell, or integument)    b    : a lipoprotein unit membrane that forms the outer layer of some virions   5  a    : a curve tangent to each of a family of curves    b    : a surface tangent to each of a family of surfaces   6   : a set of performance limits (as of an aircraft) that may not be safely exceeded    also : the set of operating parameters that exists within these limits  7   : a conventionally accepted limit  new computers that push the envelope envelopes nounas in packages Synonyms & Similar Words Relevance 
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