横向
1
Center of an atom or cell
4
Icy body with a tail near the sun
5
Our home planet
9
Blocking of light by a celestial body
13
Reddish electrical conductor
纵向
2
Compound containing oxygen
3
Amplified beam of light
6
Smallest unit of an element
7
Substance with pH above 7
8
Force that attracts objects together
10
Unit of energy
11
Preserved remains of ancient life
12
Push or pull on an object