blacker-than-black
| synchronizing signal
| blacker-than-black | |
| telecom. | 比黑更黑; 黑外 |
| synchronizing signal | |
| space | 同步信号 |
| |||
| 比黑更黑; 黑外 | |||
|
blacker-than-black : 7 phrases in 4 subjects |
| Air defense | 1 |
| General | 1 |
| Technology | 2 |
| Telecommunications | 3 |