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| backward difference | |||
| receding difference | |||
| 后向差分: 17 phrases in 9 subjects |
| Aviation | 2 |
| Bridge construction | 1 |
| Earth sciences | 2 |
| Electronics | 1 |
| Engineering geology | 1 |
| Information technology | 2 |
| Oil / petroleum | 5 |
| Space | 2 |
| Technology | 1 |
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