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| private branch exchange switchboard | |||
| branch exchange | |||
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| private branch exchange | |||
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| private automatic branch exchange | |||
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| private branch exchange | |||
| 小交 换 机: 55 phrases in 12 subjects |
| Aviation | 1 |
| Business | 2 |
| Electronics | 29 |
| General | 2 |
| Hydroelectric power stations | 2 |
| Information technology | 2 |
| Multimedia | 3 |
| Nuclear and fusion power | 1 |
| Rail transport | 1 |
| Technology | 5 |
| Telecommunications | 6 |
| United Nations | 1 |
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