| |||
darkspace | |||
dark space | |||
sonolucent space | |||
opaque area | |||
dark zone | |||
area opaca; dark field; dark region; zone of opacity | |||
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dark region |
暗区 : 27 phrases in 8 subjects |
Air defense | 1 |
Aviation | 2 |
Electronics | 3 |
General | 2 |
Metallurgy | 1 |
Physics | 1 |
Space | 2 |
Technology | 15 |