横向
1
Unit of force
4
Substance with pH above 7
6
Nerve cell in the brain
7
Biological catalyst
9
Particle of light
12
Solid with repeating atomic pattern
13
Chemical element in table salt
14
Gas form of a liquid
纵向
2
Curved glass that refracts light
3
Force that attracts objects together
5
Mass per unit volume
8
Absolute temperature scale unit
10
Unit of power
11
Gas essential for breathing
15
Preserved remains of ancient life