That means that if you draw parallel lines in space, then they will remain the same distance apart along their infinite lengths instead of converging or diverging.
这意味着如果你在空间中作两条平行线，它们不会聚合或离散，只会一直保持相等的距离无限延伸下去。
2
Thus in geometry you are told to conceive the circumference of a circle as formed of an infinite number of infinitely small straight lines.
譬如，在几何学里我们必须假定，一个圆周的圈线是由无限多喝无限小的直线形成的。
3
Each point in the image can lie on an infinite number of lines.