词汇 | envelope |
词根词缀 | 词源: 1705, from Fr. enveloppe, a back-formation of envelopper "to envelop" (see envelop). 词根记忆: n. 信封,信皮;封套The sloped envelope indicates the development velocity of printing.那个倾斜的信封显示了印刷的发展速度. |
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