横向
1
Force that attracts objects together
3
Tissue that contracts for movement
6
Chemical element in table salt
8
Particle of light
10
Naturally occurring inorganic solid
11
Biological catalyst
12
Curved glass that refracts light
纵向
2
Hottest planet in solar system
4
Icy body with a tail near the sun
5
Mass per unit volume
7
Gas essential for breathing
9
Infectious microscopic agent