No humans have ever been killed by an orca in the wild .
没有人曾被野生虎鲸杀害。
Dr visser is a leading orca researcher and has pioneered several discoveries in orca behaviour .
维瑟博士是虎鲸研究领域的领头人,在虎鲸行为学方面开辟了一些新发现。
And the unorthodox approach proved successful after the team from stanford university came up with a design modelled on the structure of the ear of orca wales .