英国国家动物园里鹿的数量曾一度减少,人们调查后发现,造成这种状况的原因是狼的数量增加了。为了给鹿创造一个更好的生存环境,管理者把所有的狼都赶走了。然而一段时间以后,公园里鹿的数量虽然显著增加,但鹿群的整体素质下降了。很多鹿饱食终日,身体臃肿,体质很差,奔跑能力大 The number of deer in the National Zoo has been reduced, and surveys have found that the number of wolves has increased as a result of this situation. In order to create a better living environment for deer, the manager rids all the wolves. However, after a period of time, although the number of deer in the park increased significantly, the overall quality of the deer fell. Many deer eat all day long, the body is bloated, poor constitution, running ability