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	Polyclitus polyclonal polyclones polycomponent polycondensation polycondensations polyconic polyconic projection polycot polycots polycottons polycotyl polycotyledon polycotyledonary polycotyledonous polycotyledons polycotyledony polycrase Polycrates polycross polycrotic polycrystal polycrystalline polycrystals polyctenid

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