横向
1
Nerve cell in the brain
3
Second lightest element
4
Icy body with a tail near the sun
8
Mass per unit volume
9
Positive particle in nucleus
14
Blocking of light by a celestial body
纵向
2
Our home planet
5
Magnetic metallic element
6
Unit of force
7
Push or pull on an object
10
Form of thermal energy
11
Basic unit of life
12
Force that attracts objects together
13
Curved glass that refracts light