横向
1
Gas essential for breathing
4
Second lightest element
5
Positive particle in nucleus
8
Icy body with a tail near the sun
9
Preserved remains of ancient life
10
Tissue that contracts for movement
纵向
2
Force that attracts objects together
3
Hottest planet in solar system
6
Our home planet
7
Element found in all living things
11
Particle of light