横向
1
Number with digits after a point
4
Rectangular array of numbers
5
Result of raising a number to an exponent
7
Steepness of a line
8
Part of a line with two endpoints
纵向
2
Lines that never intersect
3
Exact correspondence on both sides
5
Number divisible only by 1 and itself
6
Number that divides evenly into another
7
System of ordered marks for measuring
9
Amount of space an object occupies