back-of-the-envelope

短语

adj. 无需精心(或不必复杂)计算的，可容易而迅速确定的，快速而容易确定的，大体归纳出的；突然想到的

发音

UK /ˌbæk‿əv ðiː ˈɛnvələʊp/
AU
UK /-ˈɒnvələʊp/
UK /-ˈɒnvləʊp/
US /ˌbæk‿əv ði ˈɛnvəˌloʊp/
US /-ˈɑnvəˌloʊp/
US /-ɛnvəˌlop/

别名

back-of-an-envelope

释义与例句

adj.
  1. 1.

    Especially of a calculation, estimation, or other reasoning, or an idea: approximate, rough, simplified.

    粗略的

    习语 非正式

    We can do some back-of-the-envelope calculations before all the facts come in.

词源

A reference to a calculation or an idea that occurs to one being jotted down on an available scrap of paper, such as the back of an envelope.

来源：wiktionary