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| 淡出; 渐隐 | |||
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fadeout : 14 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Desert science | 1 |
| Drilling | 1 |
| Geophysics | 1 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Space | 2 |
| Technology | 4 |
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