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| material system | |||
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物质系统 : 13 phrases in 9 subjects |
| Automobiles | 1 |
| Desert science | 1 |
| Earth sciences | 3 |
| Ecology | 2 |
| Environment | 1 |
| General | 1 |
| Statistics | 1 |
| Technology | 2 |
| Water resources | 1 |
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