What is clear from the stanford team ' s earlier work with trained african elephants is that under ideal conditions , elephant infrasound calls can make seismic waves that can travel almost a mile and a half ( two kilometers ) 在通过驯服的非洲象进行的较早的研究中，斯坦福大学研究小组已清楚：理想条件下，大象的次声吼叫能使震波传播两公里左右。
The research was funded by the u . s . fish and wildlife service , african elephant conservation fund , the international fund for animal welfare , the gordon and betty moore foundation and the center for conservation biology 这项研究工作得到了美国渔业与野生动植物管理部门非洲大象保护基金会国际动物福利基金会戈登和贝蒂摩尔基金会以及环保生物学研究中心的大力资助。
As zoos across the nation debate whether to keep elephants in captivity , the pittsburgh zoo is buying a former hunting ranch to house a new conservation center to breed african elephants 就在美国各地动物园正在就是否应当继续像以前那样将大象关在笼子里圈养而辩论不休的时候，该国匹兹堡动物园近日买下了一座从前专门用于狩猎活动的牧场，打算在那里为非洲象建立一个全新的野外保护中心。
At the cites meeting in kenya in april 2000 , one of the high profile issues was the proposed downlisting , from appendix i to ii of south africa s population of african elephants to allow annual sales of ivory stocks , and proposals to resume ivory trade and trade in elephant hides and leather goods from botswana , namibia , zimbabwe to japan 2000年4月在肯尼亚举行的濒危野生动植物种国际贸易公约缔约国会议，其中一项引起广泛关注的议题是把南非的非洲象种群由附录一改为列入附录二，以准许象牙年销另外有建议恢复象牙贸易及准许博茨瓦纳纳米比亚及津巴布韦输出象皮及象革产品往日本。
As zoos across the nation debate whether to keep elephants in captivity , the pittsburgh zoo is buying a former hunting ranch to house a new conservation center to breed african elephants . the 700 - acre center could later include cheetahs , black rhinoceros , and grevy ' s zebras , but the biggest slice of the former glen savage ranch would be dedicated to pachyderms 就在美国各地动物园正在就是否应当继续像以前那样将大象关在笼子里圈养而辩论不休的时候，该国匹兹堡动物园近日买下了一座从前专门用于狩猎活动的牧场，打算在那里为非洲象建立一个全新的野外保护中心。
As zoos across the nation debate whether to keep elephants in captivity , the pittsburgh zoo is buying a former hunting ranch to house a new conservation center to breed african elephants . as zoos across the nation debate whether to keep elephants in captivity , the pittsburgh zoo is buying a former hunting ranch to house a new conservation center to breed african elephants 就在美国各地动物园正在就是否应当继续像以前那样将大象关在笼子里圈养而辩论不休的时候，该国匹兹堡动物园近日买下了一座从前专门用于狩猎活动的牧场，打算在那里为非洲象建立一个全新的野外保护中心。
