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| 代表性年份 | |||
| 典型年份，代表年度 | |||
| 典型年份; 代表年度 | |||
| 典型年 | |||
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typical year : 4 phrases in 3 subjects |
| Earth sciences | 2 |
| Economy | 1 |
| Hydroelectric power stations | 1 |
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