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光学 投影 : 51 phrases in 10 subjects |
| Automobiles | 1 |
| Aviation | 2 |
| Construction | 1 |
| Earth sciences | 1 |
| Electronics | 6 |
| General | 1 |
| Geology | 1 |
| Oil / petroleum | 2 |
| Space | 5 |
| Technology | 31 |
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