短语词组短語double envelopment 兩麪包圍;雙麪包抄envelopment tendency 發展趨勢date envelopment 數據包絡Envelopment u 環繞感listening envelopment 聽包被感envelopment rate 包封率envelopment ratio 包封率envelopment protection 環保site envelopment 釋義包膜位置 返回 envelopment