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| 51. | The rock walls sometimes supply heat, sometimes absorb it. |
| 岩壁有时放热，有时吸热。 |
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| 52. | sometimes rich, sometimes poor |
| 有时富，有时穷 |
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| 53. | a time for birth and a time for death; a time for planting and a time for uprooting; |
| 生有时，死有时。栽种有时，拔出所栽种的，也有时。 |
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| 54. | Overcoming obstructions along the route of a sewer can introduce various problems. |
| 管道线路跨越障碍会引起各种问题。 |
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| 55. | Describe the background of the emerge of the technology leapfrogging problem and summarize the domestic scholars's views on the technology leapfrogging. From the philosophy view,analyse and summarize the concept of technology leapfrogging; |
| 在评价国内学者关于技术跨越概念的基础上,从哲学视角分析了跨越的涵义与特质,界定了技术跨越的概念。 |
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| 56. | During the day, sleep comes in snatches. |
| 白天，有时睡有时醒。 |
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| 57. | Sometimes it was fists, sometimes it was truncheons, sometimes it was steel rods, sometimes it was boots. |
| 有时是拳头，有时是橡皮棍，有时是铁条，有时是皮靴。 |
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| 58. | The deposits spread for 100 kilometres across four counties. |
| 这些矿藏绵延100公里，跨越4个县。 |
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| 59. | John alternates hard work with laziness. |
| 约翰有时勤奋工作有时懒惰。 |
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| 60. | A province of east - central China crossed by the Wei He.One of the earliest cultural and political centers of China, the province is densely populated and highly industrialized.Xi'an is the capital.Population, 30, 020, 000. |
| 陕西中国中东部跨越渭河的 |
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