单词	back-of-the-envelope
释义	back-of-the-envelope adjective : done quickly to provide a rough estimate : not exact did a back-of-the-envelope calculation His method is, in effect, a back-of-the-envelope time-and-motion study. Ian Stewart Word History First Known Use 1968, in the meaning defined above
随便看	undesirably undesire undesired undesiring undesirous undespairing undespoiled undestroyable undetachable undetached undetd undetectable undetectably undetected undeterminable undeterminably undeterminate undetermined undeterred undevelopable undeveloped undeviable undeviating undeviatingly undevil

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