That's what happened here in central Africa, 这种悲剧正在非洲中部发生

221. In grasslands, the land and the animals
     在草原上 动物与环境的联系十分紧密
222. are so closely interconnected, that the loss of one key species
     以至于哪怕一种关键物种灭亡
223. could well trigger the collapse of the entire ecosystem.
     都很有可能引发整个生态系统的崩溃
224. That's what happened here in central Africa,
     这种悲剧正在非洲中部发生
225. when 95% of the elephant population were killed for their ivory.
     这里足有95%的大象因象牙而被猎杀
226. Without these essential gardeners -
     没有这些不可或缺的园丁
227. life couldn't flourish.
     生命便无法繁荣生长

来自《行星地球 第三季 第三集 Planet Earth S03E03 沙漠与草原》第 224 行