横向
1
Second lightest element
5
Unit of heredity
7
Icy body with a tail near the sun
9
Force that attracts objects together
10
Hottest planet in solar system
纵向
2
The Red Planet
3
Infectious microscopic agent
4
Center of an atom or cell
6
Biological catalyst
8
Path of a planet around the sun
11
Positive particle in nucleus