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次数每 秒 : 53 phrases in 15 subjects |
| Agriculture | 1 |
| Air defense | 2 |
| Artificial intelligence | 1 |
| Automobiles | 2 |
| Aviation | 3 |
| Computers | 1 |
| Earth sciences | 1 |
| Electronics | 32 |
| General | 2 |
| Geophysics | 1 |
| Nuclear physics | 2 |
| Radio | 1 |
| Space | 1 |
| Technology | 2 |
| Telecommunications | 1 |
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