横向
1
Precious yellow metallic element
4
Naturally occurring inorganic solid
5
Preserved remains of ancient life
6
Hottest planet in solar system
9
Smallest unit of an element
纵向
2
Mass per unit volume
3
Basic unit of life
7
Curved glass that refracts light
8
Icy body with a tail near the sun
10
Infectious microscopic agent