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	reconstitute reconstitution reconstruct Reconstruction reconstruction reconstructive reconvene record record-breaker record-breaking recorded delivery recorder record-holder recording record player recount recoup recourse recover recoverable recovery recovery program recovery room recreate recreation

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