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| system time clock | |||
| system clock | |||
| system timer | |||
| 系 统 时钟: 18 phrases in 7 subjects |
| Air defense | 1 |
| Construction | 1 |
| Electronics | 6 |
| Nuclear and fusion power | 1 |
| Project management | 2 |
| Space | 2 |
| Technology | 5 |
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