横向
1
Second lightest element
4
Nerve cell in the brain
5
Path of a planet around the sun
7
Unit of energy
纵向
2
Hottest planet in solar system
3
Force that attracts objects together
5
Compound containing oxygen
6
Naturally occurring inorganic solid
Second lightest element
Nerve cell in the brain
Path of a planet around the sun
Unit of energy
Hottest planet in solar system
Force that attracts objects together
Compound containing oxygen
Naturally occurring inorganic solid