英语单词分类 轻松记单词

envelopes

envelopes基本解释

包络线

envelopes英英释义

名词 envelope:
  • a flat (usually rectangular) container for a letter, thin package, etc.

  • any wrapper or covering

  • a curve that is tangent to each of a family of curves

  • a natural covering (as by a fluid)

  • the maximum operating capability of a system (especially an aircraft)

  • the bag containing the gas in a balloon

动词 envelop:
  • enclose or enfold completely with or as if with a covering