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材料 利用 : 28 phrases in 11 subjects |
| Agriculture | 1 |
| Automobiles | 4 |
| Aviation | 1 |
| Business | 9 |
| Commerce | 2 |
| Construction | 1 |
| Desert science | 1 |
| Ecology | 1 |
| Metallurgy | 2 |
| Plastics | 1 |
| Technology | 5 |
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