横向
1
Ball of burning gas in space
4
The Red Planet
7
Our home planet
纵向
2
Gas form of a liquid
3
Preserved remains of ancient life
5
Substance with pH below 7
6
Smallest unit of an element
8
Element found in all living things
Ball of burning gas in space
The Red Planet
Our home planet
Gas form of a liquid
Preserved remains of ancient life
Substance with pH below 7
Smallest unit of an element
Element found in all living things