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| projection system | |||
| optic projection system; optical projection system; optic projector; optical projector; projector | |||
| 投影系 统: 30 phrases in 6 subjects |
| Agriculture | 1 |
| Aviation | 2 |
| Earth sciences | 1 |
| Electronics | 8 |
| Space | 4 |
| Technology | 14 |
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