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| 构造边界 (地质图); 岩层边界 | |||
| 系统边界 | |||
| system boundary: 12 phrases in 8 subjects |
| Aviation | 1 |
| Cryptography | 1 |
| Earth sciences | 2 |
| Electronics | 3 |
| General | 1 |
| Information technology | 1 |
| Technology | 1 |
| Wind Energy | 2 |
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