横向
1
Substance with pH below 7
4
Disturbance that transfers energy
5
Second lightest element
6
Nerve cell in the brain
11
Center of an atom or cell
纵向
2
Mass per unit volume
3
Naturally occurring inorganic solid
7
Natural satellite of Earth
8
Tissue that contracts for movement
9
Measure of matter in an object
10
Chemical element in table salt