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| 长途电话局 (trunk line office) | |||
| 主交换 | |||
| 中继交换机; 长途电话局; 中继线交换机 | |||
| 中继局只设中继线，不设用户线 | |||
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| 长途电话局美; 市郊电话局英 | |||
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trunk exchange : 6 phrases in 3 subjects |
| Economy | 1 |
| Technology | 3 |
| Telecommunications | 2 |
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