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| system boundary | |||
| 系统边界: 16 phrases in 10 subjects |
| Aviation | 2 |
| Cryptography | 1 |
| Desert science | 1 |
| Earth sciences | 2 |
| Electronics | 3 |
| Environment | 1 |
| Information technology | 1 |
| Nautical | 1 |
| Technology | 3 |
| Wind Energy | 1 |
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