| 词汇 | back-of-the-envelope calculation |
| 释义 | back-of-the-envelope calculationA calculation or mathematical formulation that is approximated in a quick, informal, and rough manner, as might be sketched out on a scrap of paper (such as the back of an envelope). When it came time to pay the bill, we had to do some back-of-the-envelope calculations to figure out who owed how much. |
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