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| negative signal | |||
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负 信号 : 36 phrases in 13 subjects |
| Air defense | 5 |
| Architecture | 1 |
| Automated equipment | 1 |
| Automobiles | 3 |
| Aviation | 4 |
| Construction | 1 |
| Economy | 1 |
| Electronics | 6 |
| General | 3 |
| Oil / petroleum | 2 |
| Space | 1 |
| Technology | 4 |
| Telecommunications | 4 |
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