back-of-the-envelope

形容词 adj.
中文释义
英 /ˌbæk‿əv ðiː ˈɛnvələʊp/|/-ˈɒnvələʊp/|/-ˈɒnvləʊp/    美 /ˌbæk‿əv ði ˈɛnvəˌloʊp/|/-ˈɑnvəˌloʊp/|/-ɛnvəˌlop/

英文释义

形容词 adj.
  1. Especially of a calculation, estimation, or other reasoning, or an idea: approximate, rough, simplified. idiomatic,informal
    — We can do some back-of-the-envelope calculations before all the facts come in.

词形变化

back-of-an-envelope alternative

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.
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