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| 递归模型 | |||
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| 循环模式 (即一组变数的现值决定另一组变数的现值，而后者变数的现值决定前者的现值) | |||
| recursive model: 5 phrases in 4 subjects |
| Agriculture | 1 |
| Earth sciences | 2 |
| Project management | 1 |
| Water resources | 1 |
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