横向
1
Mass per unit volume
4
Particle of light
6
Solid with repeating atomic pattern
7
Gas essential for breathing
纵向
2
Disturbance that transfers energy
3
Infectious microscopic agent
4
Positive particle in nucleus
5
Ball of burning gas in space
Mass per unit volume
Particle of light
Solid with repeating atomic pattern
Gas essential for breathing
Disturbance that transfers energy
Infectious microscopic agent
Positive particle in nucleus
Ball of burning gas in space