横向
1
Second lightest element
4
Center of an atom or cell
6
Glass that splits light into spectrum
8
Unit of power
10
Path of a planet around the sun
纵向
2
Naturally occurring inorganic solid
3
Natural satellite of Earth
5
Substance with pH below 7
6
Particle of light
7
Our home planet
9
Blocking of light by a celestial body