单词	envelope
释义	envelope A curve or surface that is tangential to every curve or surface in a family. For example, if a family of circles has radius a and centre at a distance b > a from a fixed point C, the envelope will be an annulus with the two circles having radii b+a and b − a. An annulus as an envelope
随便看	arithmetic sequence arithmetic series arm arrangement array arrow arrow paradox Arrow's Impossibility Theorem ASA ASCII assignment problem association associative assumption astroid asymmetric asymmetric relation asymptote asymptotically equal asymptotically stable asymptotic distribution asymptotic functions asymptotic series Atiyah, Sir Michael Francis atlas

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