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| 41. | staring tracts of arid road, |
| 一段段干旱的大路， |
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| 42. | Arid Zone Research Programme |
| 干旱地区研究方案 |
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| 43. | arid cycle of erosio |
| 干燥侵蚀循环 |
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| 44. | Central Arid Zones Research Institute |
| 中央旱区研究所 |
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| 45. | Semi-arid land ecosystems |
| 半干旱地区生态系统 |
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| 46. | Desert lands are arid. |
| 沙漠地区是草木不生的。 |
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| 47. | European Arid Land Centre |
| 欧洲旱地中心 |
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| 48. | International Arid Zone Research Programme |
| 国际干旱地区研究方案 |
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| 49. | International Arid Land Consortium |
| 国际旱地集团 |
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| 50. | y from subhumid to arid |
| 在半湿润至干旱范围内的变化 |
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