She knows she needs to herd the prey into a tight group... 雌虎鲸明白它需要将猎物驱赶到一起

140. But today, she is teaching two youngsters
     但今天 它正在传授两头年轻虎鲸
141. the finer points of Mobula ray hunting.
     狩猎蝠鲼的细节诀窍
142. The rays are fast and can outmanoeuvre an orca.
     蝠鲼的速度很快 甚至快于虎鲸
143. She knows she needs to herd the prey into a tight group...
     雌虎鲸明白它需要将猎物驱赶到一起
144. ..but she can't do that on her own.
     但这项工作无法独自完成
145. It will take teamwork,
     而是需要团队合作
146. and that is today's lesson.
     而这正是这节课的主题

来自《行星地球 第三季 第二集 Planet Earth S03E02 海洋》第 143 行