横向
1
Repeated addition
4
The number representing nothing
5
Single numeral from 0 to 9
6
Distance from center to edge of circle
纵向
2
Part of a line with two endpoints
3
Split into equal parts
7
Result of addition
8
Reference line in a graph
Repeated addition
The number representing nothing
Single numeral from 0 to 9
Distance from center to edge of circle
Part of a line with two endpoints
Split into equal parts
Result of addition
Reference line in a graph