lower envelope下: below; down; under; undernea ...包: wrap络: net-like things包络: enclose; envelope card; envelope function; enveloping放下包袱: lay down the burden; laying my burdens down下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:下包络，即可在微信中查询翻译
