横向
1
Unit of power
2
Natural satellite of Earth
4
Unit of force
5
Group of similar cells
9
The Red Planet
11
Second lightest element
纵向
2
Naturally occurring inorganic solid
3
Ball of burning gas in space
6
Center of an atom or cell
7
Fourth state of matter
8
Mass per unit volume
10
Force that attracts objects together
12
Nerve cell in the brain