envelope是什么意思
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envelope
汉语翻译：n. 信封, 封套, 封袋【医】 膜, 包袋英语解释：名词 envelope:a flat rectangular paper container for papers any wrapper or covering a curve that is tangent to each of a family of curves a natural covering (as by a...
汉语翻译：n. 信封, 封套, 封袋【医】 膜, 包袋英语解释：名词 envelope:a flat rectangular paper container for papers any wrapper or covering a curve that is tangent to each of a family of curves a natural covering (as by a...