横向
1
Gas essential for breathing
4
Amplified beam of light
5
Unit of power
8
Substance with pH below 7
11
Compound containing oxygen
纵向
2
Reddish electrical conductor
3
Tectonic landmass section
6
Absolute temperature scale unit
7
Path of a planet around the sun
9
Our home planet
10
Nerve cell in the brain
12
Force that attracts objects together