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| forward difference | |||
| 前向分差: 15 phrases in 9 subjects |
| Aviation | 2 |
| Bridge construction | 2 |
| Business | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| General | 1 |
| Information technology | 2 |
| Space | 1 |
| Technology | 4 |
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