napkin math
名词 n.
英文释义
名词 n.
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The act of performing quick mathematics often as a means of estimation, as if done on the back of a napkin (or in one's head).
— Based on my napkin math—and keep in mind I am terrible at math—if you made every conscious choice to do right, your highest potential “life grade” is a D once your bad habits are subtracted.
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数据来源: Wiktionary