Have you stuck down the back of the envelope?
信封背面开口处贴牢了吗？
Write your address on the back of the envelope.
请将您的地址写在信封的背面。
Feliks saw the crest on the back of the envelope.
费利克斯看了看信封背面的顶饰。
The notes were always on scratch paper or the back of an envelope, nothing fancy.
这些笔记总是在便笺或信封背面上，没什么特别的。
Don't write the address on the back of an envelope.
不要把地址写在信封反面。
I make some rough calculation in the back of an envelope.
我在信封的背面做了一个粗略的估算。
I make some rough calculation in the back of an envelope.
我在信封的背面做了一个粗略的估算。
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