横向
1
Reddish electrical conductor
4
Path of a planet around the sun
6
Fourth state of matter
9
Chemical element in table salt
11
Basic unit of life
纵向
2
Compound containing oxygen
3
Curved glass that refracts light
5
Preserved remains of ancient life
7
Substance with pH below 7
8
Disturbance that transfers energy
10
Force that attracts objects together
12
Biological catalyst