envelopes
'envələʊps
基本解释
n. 信封( envelope的复数形式 )
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
词形变化
上一个单词：enveloped
下一个单词：enveloping