 |
| |||
| blind zone | |||
| zero signal area | |||
| blind area; zero-signal zone; dead zone; hole | |||
| zero signal zone | |||
| dead space | |||
| |||
| hole | |||
|
无信号区 : 7 phrases in 5 subjects |
| Air defense | 2 |
| Computer numerical control | 1 |
| General | 1 |
| Rail transport | 1 |
| Technology | 2 |
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