横向
1
Compound containing oxygen
4
Substance with pH below 7
6
The Red Planet
纵向
2
Infectious microscopic agent
3
Chemical element in table salt
5
Form of thermal energy
6
Naturally occurring inorganic solid
7
Our home planet
Compound containing oxygen
Substance with pH below 7
The Red Planet
Infectious microscopic agent
Chemical element in table salt
Form of thermal energy
Naturally occurring inorganic solid
Our home planet