Staggered Wheels means Front and back version: A single card has two sides of AB, and A and B are arranged separately for the front and back versions;
Left and right wheels: A left, B right, a row for the left and right wheels;
Heaven and Earth Wheel: A version of Heaven and Earth Wheel arranged on A and B below;
or:
1. The positive and negative editions mean that there are two editions, one is positive, the other is ...
2. The left and right wheels are also called self-reversion, a pair of pages, the paper is turned left and right.
3. The world wheel, the paper makes a bite up and down, row up and down, head to head or foot to foot.
It is a common saying that if there is a difference between positive and negative printing, self-turning, and roll-over on the imposition.
