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| 21. | a barrier to progress |
| 对进步的阻碍 |
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| 22. | PASS is the Program for Africa's Seed Systems. |
| PASS是非洲种子系统的计划。钱是用于种子在撒哈拉以南情况下获得更大的收获。 |
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| 23. | a fence; a barrier |
| 樊篱 |
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| 24. | Erect a trade Barrier. |
| 设置贸易障碍。 |
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| 25. | When and where should I go through the Customs? |
| 何时何处办过关手续？ |
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| -- 来源 -- 脱口说英语第一册 - 23.Going aboard by air |
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| 26. | remove a barrier between |
| 拆除在...中间障碍 |
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| 27. | It is no easy thing to produce enough grain. |
| 做到粮食基本过关不容易， |
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| 28. | a barrier against explosives. |
| 用来防止爆炸物的障碍物。 |
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| 29. | put a barrier between... |
| 使… (两者) 之间产生隔阂,挑拨离间… |
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| 30. | effect of a barrier |
| 屏障的隔声作用 |
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