横向
1
Nerve cell in the brain
4
Ball of burning gas in space
6
Measure of matter in an object
7
Particle of light
9
Unit of electric potential
10
Blocking of light by a celestial body
纵向
2
Path of a planet around the sun
3
Form of thermal energy
5
Smallest unit of an element
7
Glass that splits light into spectrum
8
Element found in all living things
11
Second lightest element
12
Substance with pH below 7
13
Unit of power