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对称 晶体 : 33 phrases in 10 subjects |
| Agriculture | 1 |
| Chemistry | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| General | 3 |
| Metallurgy | 10 |
| Oil / petroleum | 1 |
| Semiconductors | 1 |
| Space | 1 |
| Technology | 13 |
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