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conic section

noun
🔊/ˌkɒnɪk ˈsekʃn/
🔊/ˌkɑːnɪk ˈsekʃn/
(also conic)
(geometry几何)
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  1. a shape formed when a flat surface meets a cone with a round base圆锥曲线；二次曲线
    Topics Colours and Shapesc2