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| 51. | A process of behavior modification by which a subject comes to associate a desired behavior with a previously |
| 条件作用某一对象逐步将渴望的行为和先前无关的刺激因素联系起来的行为改变过程 |
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| 52. | previous closing price |
| 先前收市价 |
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| 53. | previous environment |
| 先前环境 |
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| 54. | The genome includes analogs to many essential human genes that were previously thought to be exclusive |
| 基因组中包含许多与人类关键基因很相似的基因，而我们先前以为这些基因是脊椎动物所独有的。 |
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| 55. | predecessor state |
| 先前国 |
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| 56. | The group had previously claimed responsibility for the beheading of U.S. businessman Nicholas Berg and |
| 该组织先前宣称对美国商人博格和韩国翻译金善逸的斩首事件负责。 |
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| 57. | Small planes could previously fly below1,100 feet along the river without filing flight plans or checking |
| 小飞机先前可以沿河在1100呎以下飞行而无须做出申请，或者是与航空交通管制中心确认。 |
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| 58. | Sour mashes are fermented with Both fresh and previously fermented yeast; sweet mashes employ only fresh |
| 酸性糖化醪,是用酵母发酵的,这种酵母包含一部分先前发酵过的酵母;糖化醪则是用鲜酵母制得。 |
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| 59. | And even if the danger is twice what doctors previously believed,91% of ART babies would still be born |
| 即使这种危险是医生们先前相信的两倍，但９１％这类出生的婴儿仍然完全健康。 |
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| 60. | Researchers had previously thought that carbon dioxide— which is not present in Titan's atmosphere— would |
| 研究员们先前估计二氧化碳（坦星的大气中没有这个成分）阻止化学反应生成复杂的分子。 |
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