Science Challenge

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8
7
6
3
9
5
1
2
4

横向

1

Center of an atom or cell

4

Form of thermal energy

6

Icy body with a tail near the sun

9

Unit of energy

纵向

2

Reddish electrical conductor

3

Tissue that contracts for movement

5

Fourth state of matter

7

Unit of force

8

Compound containing oxygen