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| dual IP layer | |||
| 双重 IP 层: 14 phrases in 9 subjects |
| Agriculture | 1 |
| Audio electronics | 1 |
| Business | 1 |
| Electronics | 2 |
| General | 2 |
| Oil / petroleum | 3 |
| Polo | 1 |
| Soil science | 1 |
| Technology | 2 |
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