... focus of a curve 曲线的焦点 focus of a parabola 抛物线的焦点 focus of an ellipse 椭圆的焦点 ...
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The axes of the reflecting surfaces of the two parabola reflectors are overlapped at a common axis, and the focuses of the reflecting surfaces are overlapped at a common focus.
该两个 抛物线反射镜反射面的轴线重合于公共轴线处，且各反射面焦点重合 于公共焦点处。
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