横向
1
Path of a planet around the sun
2
Precious yellow metallic element
4
Positive particle in nucleus
6
Force that attracts objects together
9
Unit of energy
10
Tissue that contracts for movement
纵向
1
Gas essential for breathing
3
Smallest unit of an element
5
Preserved remains of ancient life
7
Curved glass that refracts light
8
Form of thermal energy