They work together to drive shoals of fish into the shallows. 它们一起合作把鱼群赶到浅水区

182. that it can support fresh water dolphins.
     为淡水海豚提供了生存条件
183. These botos are huge - two and a half metres long.
     这些亚马逊江豚体型巨大 身长达2.5米
184. In these murky waters they rely on sonar to navigate and hunt.
     它们利用回声定位 在昏暗的水中探路和捕食
185. They work together to drive shoals of fish into the shallows.
     它们一起合作把鱼群赶到浅水区
186. Botos are highly social
     亚马逊江豚是高度社会型动物
187. and in the breeding season there is stiff competition for mates.
     在繁殖季节 会有一场激烈的求偶竞赛
188. The males hold court in a unique way.
     雄江豚会以独特的方式向雌江豚示爱

来自《行星地球 第一季 第三集 Planet Earth S01E03 淡水》第 185 行