class of line造句

The Moulton plane has parallel classes of lines and is an affine plane.
The lines of an affine plane of order fall into equivalence classes of lines apiece under the equivalence relation of parallelism.
Northwest designed its two classes of lines to enable agents to direct passengers at the head of either the elite line or the regular line to any security checkpoint, depending on congestion.
In this expanded plane, we define the polar of the point to be the line at infinity ( and is the pole of the line at infinity ), and the poles of the lines through are the points of infinity where, if a line has slope its pole is the infinite point associated to the parallel class of lines with slope.
It's difficult to find class of line in a sentence. 用class of line造句挺难的