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封 四 : 79 phrases in 12 subjects |
| Automobiles | 2 |
| Chemistry | 1 |
| Compressors | 1 |
| Desert science | 1 |
| Drilling | 1 |
| Electronics | 47 |
| General | 1 |
| Information technology | 17 |
| Oil / petroleum | 1 |
| Space | 2 |
| Technology | 4 |
| Telecommunications | 1 |
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