back of the envelope
信封背面 back-of-the-envelope ; Back of the Envelope (catchphrase) 邮件信封 message envelope ; ileti zarf ; berichtenvelop ; sampul pesanan .
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这些笔记总是在便笺或信封背面上，没什么特别的。
The notes were always on scratch paper or the back of an envelope, nothing fancy.
《柯林斯英汉双解大词典》
费利克斯看了看信封背面的顶饰。
Feliks saw the crest on the back of the envelope.
youdao
信封背面开口处贴牢了吗？
Have you stuck down the back of the envelope?
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