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| gain control | |||
| intensity control | |||
| brightness control | |||
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| black-white control | |||
| 亮度 调整: 8 phrases in 6 subjects |
| Earth sciences | 1 |
| General | 3 |
| Oil / petroleum | 1 |
| Radio | 1 |
| Space | 1 |
| Technology | 1 |
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