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| 鸣铃结束，闭幕; 终止; 结束 | |||
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| 振铃呼叫使对方话务台的信号灯亮 | |||
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ring down : 13 phrases in 7 subjects |
| Drilling | 2 |
| Earth sciences | 1 |
| Electronics | 2 |
| General | 3 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Telecommunications | 2 |
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