横向
1
Second lightest element
5
Disturbance that transfers energy
6
Force that attracts objects together
8
Path of a planet around the sun
纵向
2
Biological catalyst
3
Smallest unit of an element
4
Substance with pH below 7
7
Form of thermal energy
Second lightest element
Disturbance that transfers energy
Force that attracts objects together
Path of a planet around the sun
Biological catalyst
Smallest unit of an element
Substance with pH below 7
Form of thermal energy