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| 学习系统 | |||
| learning system: 21 phrases in 10 subjects |
| Artificial intelligence | 1 |
| Automobiles | 2 |
| Aviation | 1 |
| Earth sciences | 1 |
| Electronics | 5 |
| Horticulture | 1 |
| Information technology | 4 |
| Space | 3 |
| Technology | 1 |
| Telecommunications | 2 |
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