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| time of coming out; time of occurrence | |||
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| 出现时间: 24 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Dentistry | 3 |
| Desert science | 7 |
| Electronics | 2 |
| Mechanics | 1 |
| Space | 3 |
| Technology | 4 |
| Telecommunications | 1 |
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