单词	mental arithmetic
释义	mental arithmeticˌmental aˈrithmetic noun [uncountable] Examples EXAMPLES FROM THE CORPUS A quick bit of mental arithmetic was enough to make Chrissy weak at the knees. the act of adding numbers together, multiplying them etc in your mind, without writing them down:  I did a quick bit of mental arithmetic.
随便看	knockdown knock-down-drag-out knocker knock-kneed knockoff knock-on knockout knock-up knoll knot knotted knotty know know-all know-how knowing knowingly know-it-all knowledge knowledgeable knowledgeably Knowles, Beyoncé known Knox, John knuckle

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