For example, a graph of the relationship Between real Numbers and their squares matches each real number on a horizontal axis with its square on a vertical axis.

举例来说，实数与其平方的关系图表符合了横坐标上每个实数皆对应到纵坐标上的平方值。

youdao

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