横向
1
Unit of heredity
4
Amplified beam of light
5
Basic unit of life
6
Mass per unit volume
7
Second lightest element
纵向
1
Force that attracts objects together
2
Our home planet
3
Blocking of light by a celestial body
Unit of heredity
Amplified beam of light
Basic unit of life
Mass per unit volume
Second lightest element
Force that attracts objects together
Our home planet
Blocking of light by a celestial body