信封的背面
雙語對照
詞典結果：
the back of an envelope
[英][? b?k ?v ?n ?env?l?up][美][?i b?k ?v ?n ?nv?lop]
粗略的估算（或計劃）;
以上結果來自金山詞霸
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.
妳可能會有壹定量的時間來浪費，望著窗外，玩妳的訂書機，並在信封背面塗鴉，但是對於只是坐著什麽都不幹，立即去工作倒成了壹件有意思的事。
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