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| 后台［背景］控制 | |||
| 背景控制 | |||
| 背景亮度控制 | |||
| background control: 12 phrases in 5 subjects |
| Electronics | 2 |
| Geophysics | 1 |
| Oil / petroleum | 1 |
| Technology | 6 |
| Telecommunications | 2 |
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