横向
1
Push or pull on an object
4
Particle of light
5
Curved glass that refracts light
8
Force that attracts objects together
10
Unit of energy
11
Amplified beam of light
纵向
2
Unit of force
3
Group of similar cells
4
Fourth state of matter
6
Element found in all living things
7
Icy body with a tail near the sun
9
Center of an atom or cell
12
Form of thermal energy