the back of an envelope
信封的背面
双语对照
词典结果：
the back of an envelope
[英][ b?k ?v ?n ?env?l?up][美][?i b?k ?v ?n nvlop]
粗略的估算（或计划）;
以上结果来自金山词霸
例句:
1.
A certain amount of time could be wasted looking out of the window, playing with yourstapler and doodling on the back of an envelope, but quite quickly work became a moreinteresting alternative to just sitting and doing nothing.
你可能会有一定量的时间来浪费，望着窗外，玩你的订书机，并在信封背面涂鸦，但是对于只是坐着什么都不干，立即去工作倒成了一件有意思的事。
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