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| 计时器 | |||
| 计时器钟 | |||
| time-indicator: 23 phrases in 7 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Earth sciences | 1 |
| Electronics | 4 |
| Geology | 1 |
| Geophysics | 3 |
| Technology | 11 |
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