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| average content | |||
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平均 含量 : 30 phrases in 11 subjects |
| Agriculture | 1 |
| Animal husbandry | 1 |
| Automobiles | 1 |
| Desert science | 5 |
| Earth sciences | 1 |
| Ecology | 1 |
| Electronics | 2 |
| Environment | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 2 |
| Technology | 14 |
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