(BBC News)Researchers in England and Kenya have found that older elephants help a herd to survive.
（英国国家广播公司报道）英国与肯尼亚的研究人员发现，老象对象群的生存有帮助。

The older elephant's memories were found to help its herd survive.
根据发现，老象的记忆对其象群的生存有帮助。
Older elephants can distinguish normal sounds from dangerous sounds.
老象可以分辨出正常的声音与危险的声音。
This could keep the herd out of danger.
这可以让象群避开危险。