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However, none of these high-technology methods are of any value if the sites to which they are applied have never mineralized, and to maximize the chances of discovery the explorer must therefore pay particular attention to selecting the ground formations most likely to be mineralized. 但是，如果这些方法所应用的地点没有被矿化的话那么这些高科技方法就毫无价值。因此，探索者为了最大化发现矿产的机会，必须对选择最有可能被矿化的地质构成给予特别的关注。 Rather，the coincidence of increased United States government antidiscrimination pressure in the mid-1960s with the acceleration in the rate of black economic progress beginning in 1965 argues against the community theorists’ view. 20世纪60年代中期，美国政府反对歧视的压力不断升高，与此同时，从1965年开始，黑人经济状况改善的步伐越来越快。确切的说，这两个事件的同时发生违背了连续性理论家的观点。 Although at first the colonies held little positive attraction for the English—they would rather have stayed home—by the eighteenth century people increasingly migrated to America because they regarded it as the land of opportunity. 虽然起初对于英国人来说没有什么正面的吸引力，他们宁愿呆在家里，但是到了18世纪的时候，越来越多的人移民到美国，因为他们将美国视为一片充满机会的土地。 Although surveys of medieval legislation, guild organization, and terminology used to designate different medical practitioners have demonstrated that numerous medical specialties were recognized in Europe during the Middle Ages, most historians continue to equate the term “women medical practitioner”, wherever they encounter it in medieval records, with “midwife”. 虽然关于中世纪的立法、行会组织和用于命名不同医术人员的术语做了许多调查，而且这些调查证明了中世纪欧洲的许多医学专家都被正式认可，但是大部分历史学家只要在中世纪文献中遇到“女性医护人员”这个术语时，还是会把这个术语等同于“接生婆”。 One might conclude that the older labor-intensive machinery still operating in United States integrated plants is at fault for the poor performance of the United States industry, but this cannot explain why Japanese integrated producers, who produce a higher-quality product using less energy and labor, are also experiencing economic trouble. 或许有人会总结道，老式的、密集劳动型的机制依旧在美国的大型工厂中运作，正是这些机制应该为美国工业不尽人意的表现负责，但是这并不能解释为什么即使日本的一体化生产商可以利用更少的资源与劳力生产出更高质量的产品，但他们也依旧处于经济困难的状态。 Moreover，the almost simultaneous abolition of Russian serf