You can think of it this way.

To the left of 0 is a negative number, first -2, then-1, then-1 >-2.

Then 0 and-1, 0 >- 1.

Then 0 and 1, 1 > 0.

Then 1 and 2,2 >1.

These four steps can be summarized.

The number axis is defined as a straight line that specifies the origin, positive direction and unit length.

The stipulation means that the correct direction is the positive direction, and if it can be reversed, there is no standard, and the stipulation is also a white stipulation.

Since the number of axes is mentioned, this rule is acquiesced. Needless to say. Just like a map, there is no need to explain up, down, south, left, west, right and east.