事实上，黄石野牛大约有一半遭受了布鲁氏菌病——一种欧洲牛群带到美国的细菌疾病——可能引起牛流产。
In fact, about half of Yellowstone's bison have been exposed to brucellosis, a bacterial disease that came to North America with European cattle that may cause cattle to miscarry.
自那时起，欧洲的牛和猪的养殖者一直担心这一灾难还会重演。
Since then, Europe's cattle and pig farmers have worried that the disaster could repeat itself.
西班牙处于欧洲的西南部，它和葡萄牙、直布罗陀和安道尔共同拥有伊比利亚半岛，在北部，沿着比利牛斯山脉它邻近法国和安道尔公国。
Spain is a country located in the southwest of Europe. It shares the Iberian Peninsula with Portugal, Gibraltar and Andorra.
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