So the Pittsburgh Zoo, which keeps Jackson at a conservation centre a little way outside the city, has joined an international effort to establish North America's first elephant sperm bank.

因此，匹兹堡动物园已加入一项国际计划，建立北美洲第一个大象精子库。这家动物园将 杰克逊养在离城市很近的一个动物养护中心里。