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| 自动交换机; 道岔自动集中系统 | |||
| 自动交换系统; 自动转接系统 | |||
| automatic switching system: 31 phrases in 8 subjects |
| Aviation | 3 |
| Business | 2 |
| Earth sciences | 2 |
| Electronics | 10 |
| General | 1 |
| Space | 4 |
| Technology | 6 |
| Telecommunications | 3 |
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