单词	parabolic
释义	parabolaparabola /pəˈræbələ/ noun [countable] Etymology ETYMOLOGYparabola Origin: 1500-1600 Modern Latin Greek parabole; ➔ PARABLE math, geometry a curved shape formed by a plane (=flat surface) crossing through the side of a cone so that the distance from the curve to a fixed point inside the curve and the distance from the curve to the directrix (=line outside the curve) are always the same. A parabola looks like the curve that a ball makes when it is thrown high in the air and comes down a short distance away.—parabolic /ˌpærəˈbɑlɪk◂/ adjective:  a parabolic curve → conic section
随便看	Serbia sere serenade serendipity serene serenely serenity serf serfdom serge sergeant sergeant-at-arms sergeant major serial serialization serialize serially serial monogamist serial monogamy serial number series series circuit serif serious seriously

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