http://www.pons.de/produkte/3-12-517841-X/（牛津大学出版社授权产品）
back-of-the-envelope [美 ˌbækəvðiˈɛnvəloʊp, 英 ˌbakəvðəˈɛnvələʊp] 形
back-of-the-envelope calculation/estimates:
在《PONS词典》中的词汇
英语
西班牙语
window envelope 名词
在《PONS词典》中的词汇
英语
西班牙语
window envelope 名词
单语范例（未经PONS编辑处理）
If you are unable to visit the foreign government office in person, you will have mail in your passport, fees and application form along with a self-addressed return envelope.
www.castanet.net I had read in an article that writers should always send a self-addressed stamped envelope along with a script they were submitting.
en.wikipedia.org The winners name can be obtained by writing to the competition address with a self-addressed envelope after the closing date.
www.bordercountiesadvertizer.co.uk The organization, consisting of six young self-addressed millennials, has only been around for a year.
torontoobserver.ca If mailing your query, be sure to enclose a self-addressed, stamped envelope for the agent's response.
www.huffingtonpost.com