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21. | average annual discharge |
| 多年平均流量 |
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22. | at one time; used to;once upon a time |
| 曾经;一度 |
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23. | one day; once |
| 某日;曾经 |
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24. | multi-year country programming |
| 多年国家方案 |
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25. | have been to; have gone to |
| 曾经去过 |
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26. | The long years of "political tutelage" have yielded nothing. |
| “训政”多年,毫无结果。 |
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27. | Construction lasted 1800 years. |
| 凡1800多年。 |
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28. | annual average benefit |
| 多年平均效益 |
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29. | He has trafficked in drugs for many years. |
| 他贩卖毒品多年。 |
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30. | average annual precipitatio |
| 多年平均降水量 |
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