在那里生活了几个世纪后，他们相信自己丰富的传统知识对完成这项任务至关重要。
Having survived there for centuries, they believe their wealth of traditional knowledge is vital to the task.
他一直不吝分享自己丰富的知识。
除了拯救生命之外，知识丰富的演讲者还帮助人们学习新技能，解决问题，了解自己身处的这个令人兴奋的世界上引人入胜的事情。
In addition to saving lives, informative speakers help people learn new skills, solve problems and acquire fascinating facts about the exciting world in which they live.
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