The Earth's axis of rotation is tilted in relation to the ecliptic plane, an imaginary surface through Earth's orbit around the sun.

地球的自转轴与黄道面呈一定角度。黄道面是地球公转轨道所在的一个假想平面。

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The symmetric values about the imaginary axis of zero-poles which the unstable process lies in the open and closed right-half plane are defined as their mirror-injection.

非稳定过程在开右半平面的零极点关于虚轴的对称值称为该零极点的镜像映射。

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And, as Euler's successor, Carl Friedrich Gauss, was to discover, if you plot real numbers on one axis of a graph and imaginary ones on the other, you create a plane that represents both sorts of numbers.

ECONOMIST: Beno?t Mandelbrot

Complex numbers, which have a real and an imaginary part added together, are the points on this plane that do not lie on either axis.

ECONOMIST: Beno?t Mandelbrot