横向
1
Ball of burning gas in space
4
Natural satellite of Earth
6
The Red Planet
8
Our home planet
纵向
2
Disturbance that transfers energy
3
Mass per unit volume
5
Smallest unit of an element
7
Measure of matter in an object
Ball of burning gas in space
Natural satellite of Earth
The Red Planet
Our home planet
Disturbance that transfers energy
Mass per unit volume
Smallest unit of an element
Measure of matter in an object