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	abidances abide abide (beyond) abide beyond abide by abided abided (beyond) gas gland gas grenade gas helmet gas jet gas lamp gas law gas lift gas lime gas liquor gas log gas mask gas meter gas oil gas packing gas pedal gas pedals gas pipe gas plant

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