横向
1
Positive particle in nucleus
4
Chemical element in table salt
5
Unit of force
7
Icy body with a tail near the sun
11
Ball of burning gas in space
纵向
2
Center of an atom or cell
3
Unit of power
6
Smallest unit of an element
8
Force that attracts objects together
9
Naturally occurring inorganic solid
10
Unit of electric potential