横向
1
Amplified beam of light
3
Unit of force
6
Substance with pH below 7
7
Hottest planet in solar system
8
Force that attracts objects together
11
Center of an atom or cell
纵向
2
Magnetic metallic element
4
Compound containing oxygen
5
Our home planet
8
Unit of heredity
9
Mass per unit volume
10
Unit of electric potential
12
Natural satellite of Earth