横向
1
Basic unit of life
3
Path of a planet around the sun
4
Substance with pH below 7
6
Compound containing oxygen
7
Gas form of a liquid
纵向
2
Our home planet
4
Smallest unit of an element
5
Precious yellow metallic element
Basic unit of life
Path of a planet around the sun
Substance with pH below 7
Compound containing oxygen
Gas form of a liquid
Our home planet
Smallest unit of an element
Precious yellow metallic element